mm. 380

Molar 380 Molar Energy 241 Molecular Affinity 380 Molecular Attraction 380 Molecular Bombardment 380 Molecular Chain 380 Molecular Energy 241 Molecular Heat 286 Molecular Rigidity 380, 473 Molecular Shadow 480 Molecule 380 Moment 381 Moment, Magnetic 349 Moment of Couple 544 Moment, Turning 544 Monophote Lamp 321 Mordey Effect 381 Morse Receiver 381 Morse Recorder 451 Morse Telegraph 512 Mortar, Electric 382 Motion, Currents of 167 Motograph, Electro- 229 Motor. Compound or Compound Wound,. 382 Motor, Differential 382 Motor, Dynamo 200 Motor, Electric 382 Motor, Electro- 229 Motor, Electro-motive Force 384 Motor-generator 384 Motor, Multiphase 384 Motor, Overtype 399 Motor, Prime 385 Motor, Pulsating 386 Motor, Pyromagnetic 442 Motor, Reciprocating 385 Motor, Series 386 Motor, Shunt 386 Moulded Mica 376 Moulding 58 Movable Secondary 477 Mud, Battery 68 Multiphase Currents 166 Multiphase Motor 384 Multiple 386 Multiple Arc 387 Multiple Arc Box 387 Multiple Connected Battery 68 Multiple-series 387, 480 Multiple Switch 501 Multiple Switch Board 387 Multiple Transformer 548 Multiple Winding 579 Multiple Wire Method 388 Multiplex Harmonic Telegraph 510 Multiplex Telegraph 514 Multiplex Telegraphy 388 Multiplier, Schweigger's 476 Multiplying Power 347, 349 Multiplying Power of a Shunt 388 Multipolar Armature 46 Multipolar Dynamo 200 Multipolar Electric Bath 57 Multipolar Winding 579 Muscular Pile 388 Mutual Electro-magnetic Induction 302 Mutual Electrostatic Induction 303 Mutual Induction, Coefficient of 301 Mutual Induction Protector 481 Myria 388

Nairne's Electrical Machine 389 Napierian Logarithms 389 Nascent State 389 Natural Currents 166, 389 Natural Magnet 361 Needle 389 Needle Annunciator 35 Needle, Astatic 50 Needle, Dipping 185 Needle, Magnetic 349 Needle, Orientation of a Magnetic 397 Needle of Oscillation 389 Needle Telegraph, Single 519 Needle, Telegraphic 389 Negative Charge 389 Negative Current 164 Negative Electricity 389 Negative, Electro- 229 Negative Element 390 Negative Feeder 251 Negative Lead of Brushes 324 Negative Plate 417 Negative Pole 425 Negative Potential 432 Negative Side of Circuit 125 Nerve and Muscle Current 164 Nerve Currents 390 Net Efficiency 205 Net, Faraday's 250 Network 390 Neutral Armature 46 Neutral Feeder 251 Neutral Line of Commutator 390 Neutral Line of Magnet 361 Neutral Point 421 Neutral Point of Commutator 390 Neutral Point, Thermo-electric 390 Neutral Relay Armature 46, 390 Neutral Temperature 390 Neutral Wire 390 Neutral Wire Ampere Meter 391 N. H. P. 391 Niaudet's Battery 61 Nickel 391 Nickel Bath 391 Night Bell 392 Nitric Acid Battery 68 Nobili's Rings 392 Nodal Point 422 Nodular Deposit 392 Nominal Candle Power 101 Non-conductor 392 Non-essential Resistance 465-467 Non-inductive Resistance 467 Non-polar Dynamo 200 Non-polarizable Electrodes 210 Non-Polarized Armature 46 Normal Magnet 361 North Magnetic Fluid 357 North Pole 392 North Seeking Pole 393 Null Method 393 Null Point 422

Occlusion 393 Oerstedt 394 Oerstedt's Discovery 394 Oerstedt, Milli- 380 Ohm 394 Ohmage 394 Ohm, B. A. 394 Ohm, Board of Trade 394 Ohm, Congress 395 Ohmic Resistance 394, 467 Ohm, Legal 395 Ohmmeter 395 Ohm, Rayleigh 396 Ohm's Law 396 Ohm, True 396 Oil Insulation 396 Oil Transformer 548 Old Armature, Siemens' 49 Olefiant Gas 397 Omnibus Bar 94 Omnibus Rod 94 Omnibus Wire 94 One Coil Electro-magnet 219 Open 397 Open Circuit 125 Open Circuit Battery 68 Open Circuit Induction 303 Open Circuit Oscillation 397 Open Coil Armature 46 Open Coil Dynamo 200 Opening Shock 482 Operation, Magnet 365 Opposed Current 164 Optics, Electro- 229 Orders of Currents 167 Ordinate 397 Ordinates, Axis of 54, 397 Ores, Electric Reduction of 453 Ores, Magnetic Concentration of 340 Organ, Electric 397 Orientation of a Magnetic Needle 397 Origin of Co-ordinates 397 Oscillation, Centre of 112 Oscillation, Electric 398 Oscillation, Needle of 389 Oscillation, Open Circuit 397 Oscillatory 23 Oscillatory Discharge 188 Oscillatory Displacement 398 Oscillatory Electro-motive Force 398 Oscillatory Impedance 297 Oscillatory Induction 398 Osmose, Electric 398 Outlet 399 Output 399 Output, Magnetic 399 Output, Unit of 399 Over-compounding 399 Over, Flashing 258 Overflow Alarm 18 Over-house Telegraph 515 Overload 399 Overtype Dynamo or Motor 399 Oxide of Copper Battery 68 Ozone 399

Pacinotti's Inductor 400 Pacinotti's Ring 400 Pacinotti Teeth 400 Page Effect 401 Page's Revolving Armature 47 Paillard Alloys 400 Palladium 401 Pane, Fulminating 262 Pane, Luminous 401 Pantelegraphy 402, 510 Paper Filaments 402 Parabola 402 Parabolic Reflector 402 Paraffine 402 Paraffine Wax 402 Paragrêles 403 Parallax 403 Parallel 403 Parallel Circuits 123-126 Parallelogram of Forces 260 Parallels, Magnetic 349 Paramagnetic 403 Paramagnetism 404 Parasitical Currents 163 Parchmentizing 404 Partial Current 164 Partial Earth 203, 404 Partial Vacuum 557 Passive State 404 Path, Alternative 24 P. D. 404 Peltier's Cross 405 Peltier Effect 404 Pen, Electric 405 Pendant Cord 405 Pendulum Circuit Breaker 121 Pendulum, Electric 405 Pendulum or Swinging Annunciator 35 Pentane Standard, Harcourt's 406 Pentode Working 581 Percussion, Centre of 112 Perforated Armature 45 Perforated Core Discs 154 Perforator 407 Period 407 Period, Vibration 560 Periodic 23 Periodic Current, Power of 433 Periodicity 262, 408 Peripolar Zone 582 Permanency 408 Permanent Magnet 365 Permanent Magnet Ammeter 28 Permanent State 408 Permeability 346-349 Permeability-temperature Curve, 174 Permeameter 408 Permeance 408 Peroxide of Lead Battery 69 Perturbations, Magnetic 350 Pflüger's Law 409 Phantom Wires 409 Phase 409 Phase, Retardation of 471 Phenomenon, Porret's 427 Pherope 409, 527 Philosopher's Egg 409 Phonautograph, 409 Phone 409 Phonic Wheel 409 Phonograph 410 Phonophone or Rate Governor, Langdon Davies' 450 Phonozenograph 410 Phosphorescence 410 Phosphorous, Electrical Reduction of 410 Photo-electric Microscope 410 Photo-electricity 410 Photo-electro-motive Force 410 Photometer 411 Photometer, Actinic 411 Photometer, Bar 411 Photometer, Bunsen's 412 Photometer, Calorimetric 412 Photometer, Dispersion 412 Photometer, Shadow 414 Photometer, Translucent Disc 412 Photophore 415 Photo-voltaic Effect 415 Physical Energy 241 Physiology, Electro- 231 Piano, Electric 415 Pickle 415 Picture, Electric 415 Piece, Bed 78 Piece, Magnetic Proof 350 Piece, Pole 423 Pierced Core-discs, 152 Pile 415 Pile, Differential Thermo-electric 533 Pile, Muscular 388 Pile or Battery, Thermo-electric 530 Pilot Brush 91 Pilot Lamp 323 Pilot Transformer 415 Pilot Wires 415 Pistol, Electric 416 Pith 416 Pith Ball Electroscope 234 Pith-balls 416 Pivoted Armature 47 Pivot Suspension 416 Plane, Magnetic Proof 350 Plant 417 Plant Electricity 417 Plant, Isolated 309 Planté's Secondary Battery, 72 Plate, Arrester 417 Plate Condenser 417 Plate, Earth 203 Plate Electrical Machine 417 Plate, Franklin's 262 Plate, Generating 277 Plate, Ground 417 Plate, Negative 417 Plate, Positive 277, 417 Plating Balance 417 Plating Bath 418 Plating, Electro- 418 Platinized Carbon Battery 69 Platinoid 418 Platinum 419 Platinum Alloy 419 Platinum Black 419 Platinum Silver Alloy 419 Platinum Sponge 419 Play, End 238 Plow 420 Plücker Tubes 420 Plug 420 Plug Cut Out 175 Plug, Double 191 Plug, Grid 420 Plug, Infinity 305, 420 Plug Key 316 Plug Switch 420 Plumbago 421 Plunge Battery 69 Plunge 421 Plunger and Coil 131 Plunger and Coil, Differential 132 Plunger, Coil and 131 Plunger Electro-magnet 220 Pneumatic Battery 69 Pneumatic Signals, Electro- 231 P.O. 421 Pockets, Armature 47 Poggendorf's Solution 421 Point, Contact 147 Point, Indifferent 421 Point, Neutral 421 Point. Nodal 422 Point, Null 422 Point of Commutator, Neutral 390 Point Poles 422 Points, Consequent 422 Points, Corresponding 422 Points, Iso-electric 422 Points of Derivation 180, 423 Point, Thermo-electric Neutral 390 Polar Angle 423 Polar Extension 423 Polarity, Diamagnetic 181, 423 Polarity, Resultant 470 Polarization 423 Polarization, Back Electro-motive force of 156 Polarization Capacity 424 Polarization, Dielectric 183 Polarization, Galvanic 265 Polarization, Magnetic Rotary 351 Polarization of the Medium 424 Polarized Armature 47 Polarized Electro-magnet 220 Polarized Relay 458 Polarized Relay, Tongue of 542 Polarizing Current 164 Polar Region 424 Polar Span 424 Polar Span, Angle of 32, 423 Polar Tips 423 Polar Zone 582 Pole, Analogous 31, 425 Pole, Antilogous 425 Pole, Armature 47 Pole, Austral 54 Pole, Boreal 85 Pole Brackets, Telegraph 515 Pole Changer 425 Pole Changing Switch, 501 Pole Dynamo, Interior 199 Pole, Magnet 366 Pole, Negative 425 Pole, North 392 Pole, North-seeking 393 Pole or End, Marked 368 Pole Piece 423 Pole Pieces 425 Pole, Positive 425 Pole, Salient 426 Pole, Terminal 529 Pole Tips 290, 426 Pole, Traveling 426 Pole, Unit Magnet 366 Poles 425 Poles, Compensating 426 Poles, Consequent 146 Poles, Idle 296 Poles, Magnetic 350 Poles, Magnetic, False 350 Poles of Intensity 426 Poles of Verticity 426, 560 Poles, Point 422 Poles, Secondary 478 Poles, Secondary Magnet 366 Polyphase Currents 167 Polyphote Lamp 323 Popgun, Electric 282 Porous Cell 427 Porous Cup 159, 426 Porret's Phenomenon 427 Portative Power of Magnet 366 Portelectric Railroad 427 Portrait, Electric 415 Position, Energy of 241 Position Finder 427 Position, Sighted 484 Positive Current 164 Positive Direction 428 Positive Electricity 428 Positive Element 277 Positive Feeder 251 Positive Plate 277, 417 Positive Pole 425 Positive Potential 432 Positive Side of Circuit 125 Post Office 428 Posts, Binding, or Screws 81 Potential 428 Potential, Absolute 428 Potential, Constant 429 Potential Difference, Contact 147 Potential Difference, Electric 429 Potential Difference, Electro-motive 429 Potential, Electric Absolute 429 Potential, Fall of 430 Potential Galvanometer 269 Potential in Armature, Curve of Distribution of 172 Potential, Magnetic 350, 431 Potential, Negative 432 Potential or Static Energy 241 Potential, Positive 432 Potential Regulation, Constant 455 Potential, Unit of Electric 432 Potential, Zero 432, 582 Potentiometer 432 Poundal 433 Pound-foot 259 Power 438 Power, Candle 100 Power, Directive 187 Power, Electric 433 Power, Horse 290 Power, Illuminating 296 Power, Multiplying 349 Power of Magnet, Portative 366 Power of Periodic Current 433 Powers of Ten 527 Power, Stray 495 Power, Thermo-electric 533 Press Button 94 Pressel 434 Pressure 434 Pressure, Electric 434 Pressure, Electrification by 434 Primary 434 Primary Ampere-turns 31, 551 Primary Battery 69, 434 Prime 434 Prime Conductor 146, 434 Prime Conductor, Coatings of a 129 Prime Motor 385 Principle, Gauss' 276 Printing Telegraph 515 Probe, Electric 435 Projecting Power of a Magnet 435 Prony Brake 435 Proof Piece, Magnetic 350 Proof-plane 436 Proof Plane, Magnetic 350 Proof-sphere 436 Proportional Galvanometer 269 Proportionate Arms 436 Prostration, Electric 437 Protector, Body 84 Protector, Comb 437 Protector, Electric 437 Pull 437 Pulsatory Current 164 Pulsatory Field 256 Pulsating Motor 386 Pulvermacher's Electro-medical Battery 69 Pump, Geissler 437 Pump, Sprengel 439 Pump, Swinburne 440 Pumping 439 Puncture-electro 232 Puncture-galvano 232 Push Button 93. 98, 440 Push, Desk 180 Push, Floor 258 Pyro-electricity 441 Pyromagnetic Generator 442 Pyromagnetic Motor 441 Pyromagnetism 443 Pyrometer, Siemens' Electric 443

Q 443 Quad 288, 443 Quadrant 288, 443 Quadrantal Deviation 180 Quadrant, Legal 444 Quadrant, Standard 444 Quadrature 444 Quadruplex Telegraph 515 Qualitative 444 Quality of Sound 444 Quantitative 444 Quantity 444 Quantity Armature 47 Quantity, Electric 444 Quantity, Electro-magnetic 445 Quantity, Electro-magnetic, Practical Unit of 445 Quantity, Electrostatic 445 Quantity Galvanometer 269 Quantity, Magnetic 350 Quantity Meter 445 Quartz 445 Quicking 446

R 446 Racing of Motors 446 Radial Armature 47 Radian 446 Radiant Energy 446 Radiant Matter 368 Radiation 446 Radicals 446 Radiometer 447 Radiometer, Electric 447 Radio-micrometer 447 Radiophony 447 Railroad, Portelectric 427 Range Finder 447 Rate Governor 449 Rate Governor or Phonophone, Langdon Davies' 450 Rated Candle Power 101 Ratio Arms 437 Ratio, Core 154 Ratio, Shunt 483 Ratio, Velocity 560 Ray, Electric 450 Rayleigh Ohm 396 Reaction Coil 132 Reaction of a Dynamo Field and Armature 450 Reaction of Degeneration 179 Reactions, Anodic 36 Reactions, Armature 47 Reaction Telephone 527 Reaction Wheel 259 Reading Galvanometer, Direct 269 Reading, Sound 489 Reading Telescope 450 Real Efficiency of Secondary Battery 205 Real Hall Effect 284 Réaumur Scale 450 Recalescence 451 Receiver 451 Receiver, Harmonic 284, 451 Receiver, Morse 381 Receptive, Electro- 232 Recharge 115 Reciprocal 451 Reciprocating Motor 385 Recoil Circuit 125 Recorder, Chemical 117 Recorder, Morse 451 Recorder, Siphon 452 Record, Telephone 451 Rectification of Alcohol, Electric 18 Rectified Current 164 Rectilinear Current 165 Red Varnish 559 Red Magnetism 357 Redressed Current 165 Reduced Resistance 467 Reducteur for Ammeter 453 Reducteur for Voltmeter 453 Reduction of Ores, Electric 453 Reduction of Phosphorous, Electrical 410 Reflecting Galvanometer 270 Reflector, Parabolic 402 Refraction, Electric Double 454 Refraction, Electrostatic 235 Refreshing Action 454 Region, Extra-polar 454 Region, Intrapolar 307 Region, Polar 424 Register, Electric 454 Register, Telegraphic 454 Regulation, Constant Current 454 Regulation, Constant Potential 455 Regulation of Alternating Current Dynamo 195 Regulation of Dynamos 455 Reguline 456 Relative 456 Relative Calibration 98 Relay 456 Relay Bell 80 Relay Bells 457 Relay, Box Sounding 457 Relay Connection 457 Relay, Differential 457 Relay Magnet 457 Relay, Microphone 377, 457 Relay, Neutral, Armature 390 Relay, Polarized 457 Reluctance 458 Reluctance, Magnetic 351, 458 Reluctance, Unit of 438 Reluctivity 459 Reluctivity, Magnetic 351 Remanence 459 Remanence, Magnetic 358 Removal of Hair by Electrolysis 283 Renovate 115 Repeater 459 Repeater, Telegraph 518 Replenisher, Sir Wm. Thomson's 459 Repulsion, Magnetic 338 Repulsion and Attraction, Electrostatic 234 Repulsion and Attraction, Electro-magnetic 217 Reservoir, Common 460 Residual Atmosphere 460 Residual Capacity 103 Residual Charge 116 Residual Magnetism 358 Residue, Electric 116, 460 Resin 460 Resinous Electricity 461 Resistance 461 Resistance, Apparent 297, 462 Resistance, Assymmetrical 462 Resistance Box 462 Resistance, B. A. Unit of 462 Resistance Box, Sliding 463 Resistance, Breguet Unit of 463 Resistance Bridge 577 Resistance Coil 137 Resistance Coil, Standard 464 Resistance, Carbon 463 Resistance, Combined 464 Resistance, Compensating 144 Resistance, Critical 464 Resistance, Dielectric 183, 464 Resistance, Digney Unit of 464 Resistance, Electrolytic 464 Resistance, English Absolute or Foot-second Unit of 465 Resistance, Equivalent 465 Resistance, Essential 465 Resistance, External 465 Resistance Frame 465 Resistance, German Mile Unit of 466 Resistance, Hittorf's 466 Resistance, Inductive 466 Resistance, Insulation 466 Resistance, Internal 466 Resistance, Jacobi's Unit of 466 Resistance, Joint 464 Resistance, Magnetic 351, 458 Resistance, Matthiessen's Meter-gram Standard of 466 Resistance, Matthiessen's Unit of 466 Resistance, Meter-millimeter Unit of 466 Resistance, Mil-foot Unit of 467 Resistance, Non-essential 465, 467 Resistance, Non-inductive 467 Resistance of Human Body 467 Resistance, Ohmic 394, 467 Resistance, Reduced 467 Resistance, Siemens' Unit of 467 Resistance, Specific 467 Resistance. Specific Conduction 467 Resistance, Spurious 467 Resistance, Steadying 468 Resistance, Swiss Unit of 468 Resistance, Thomson's Unit of 468 Resistance to Sparking 490 Resistance, True 467 Resistance, Unit 468 Resistance, Unit of, B. A. 78 Resistance, Varley's 559 Resistance, Varley's Unit of 468 Resistance, Virtual 297 Resistance, Weber's Absolute Unit 468 Resolution of Forces 261 Resonator, Electric 468-470 Rest, Currents of 167 Resultant 470 Resultant Polarity 470 Retardation 470 Retardation of Phase 471 Retentivity 471 Retentivity, Magnetic 351 Retort Carbon 471 Return 471 Return Circuit 125 Return, Earth 203 Return Stroke 55 Reversal, Thermo-Electric 533 Reverse Current Working 581 Reverse-induced Current 163 Reverser, Current 165 Reversibility 471 Reversible Bridge 472 Reversing Key 316 Reversing Switch 501 Revivify 115 Revolving Armature, Page's 47 Rheochord 472 Rheometer 472 Rheomotor 472 Rheophore 472 Rheoscope 472 Rheoscopic Frog 262 Rheostat 472 Rheostat Arm 472 Rheostatic Machine 472 Rheostat, Wheatstone's 472 Rheotome 473 Rheotrope 473 Rhigolene 473 Rhumbs 473 Rhumkorff Coil 138, 473 Ribbon Coil 138 Ribbon Core 154 Right-handed Screw Law 324 Rigidity, Molecular 380, 473 Ring, Ampere 30 Ring Armature 48 Ring. Collecting 139 Ring Contact 473 Ring Core 155 Ring, Dynamo 200 Ring, Faraday's 473 Ring, Foundation 261 Ring, Guard 282 Ring, Pacinotti's 400 Rings, Electric 392 Rings, Nobili's 392 Ring, Split, Commutator 141 Roaring 474 Rocker 474 Rocker Arms 50, 474 Rod, Bus 94 Rod, Discharging 189 Rod, Omnibus 94 Roget's Spiral 474 Rolling Armature 49 Rosin 460 Rotary Polarization, Magnetic 351 Rotating Brush 91 Rotating Field 256 Rotation of Liquids, Electro-dynamic 474 Rotation of Liquids, Electro-magnetic 475 Rotatory Currents 167 Rubber 102, 475 Rubber, India 102

Saddle Bracket 475 Safety Catch 175 Safety Cut Out 175 Safety Device 475 Safety Fuse 175, 475 Safety Fuse, Plug, or Strip 475 Sal Ammoniac Battery 69 Salient Pole 426 Salt 475 Salt, Dronier's 192 Salt or Sea-salt Battery 69 Sand Battery 90 Saturated 476 Saturation, Magnetic 351 Saw, Electric 476 Scale, Fahrenheit 248 Scale, Réaumur 450 Scale, Tangent 502 Schweigger's Multiplier 476 Scratch Brushes 476 Screen, Electric 476 Screen, Magnetic 351 Screen, Methven 376 Screws or Posts, Binding 81 Sealed, Hermetically 289 Sea Salt or Salt Battery 69 Secohm 288 Second, Ampere- 30 Secondary Actions 477 Secondary Ampere-turns 31, 551 Secondary Battery 70 Secondary Battery, Efficiency of, Quantity 205 Secondary Battery, Planté's 72 Secondary Clock 127 Secondary Current 166 Secondary Generator 277, 477 Secondary Magnet Poles 366 Secondary, Movable 477 Secondary Plates, Colors of 478 Secondary Poles 478 Secretion Current 166 Section Trolley 549 Sectioned Coils 138 Seebeck Effect 478 Segments 56 Segments, Commutator 56 Selenium 478 Selenium Cell 478 Selenium Eye 478 Self-exciting Dynamo 201 Self-induction 303 Self-induction, Magnetic 352 Self-induction, Unit of 304 Self-repulsion 478 Self-winding Electric Clock 128 Semi-circular Deviation 181 Semi-conductors 478 Semi-incandescent Lamp 323 Sender, Zinc 582 Sensibility 479 Sensitiveness, Angle of Maximum 479 Separate Circuit Dynamo 201 Separate Touch 359, 479 Separate Touch, Magnetization by 359 Separately Excited Dynamo 201, 479 Separation of Electricities 479 Separator 479 Separator, Magnetic 352 Series 479 Series and Long Shunt Winding 579 Series and Separate Coil Winding 579 Series and Short Shunt Winding 580 Series, Contact 147 Series Dynamo 201 Series, Electro-chemical 209 Series, Electro motive 228 Series, Electrostatic 235 Series Motor 386 Series, Multiple- 387 Series-multiple 480 Series, Thermo-electric 534 Series Transformer 548 Series Winding 579 Service Conductors 480 Serving 480 Shackle 480 Shadow, Electric 480 Shadow, Molecular 480 Shadow Photometer 414 Sheath for Magnet Coils 481 Sheath for Transformers 481 Sheath, Induction 303 Sheet Current 166 Shell, Magnetic 352 Shell, Strength of Magnetic 352 Shellac 481 Shellac Varnish 481 Shield, Anti-magnetic 37 Shield, Magnetic 351, 353 Shielded 481 S. H. M. 482 Shock, Back, or Stroke of Lightning 55 Shock, Break 482 Shock, Electric 482 Shock, Opening 482 Shock, Static 482 Short Circuit 482 Short Circuit Working 482 Short Fall Air Pumps 16 Short Shunt Winding 579 Shovel Electrodes 483 Shower Bath, Electric 57 Shunt 483 Shunt Box 483 Shunt Circuit 123, 126 Shunt Dynamo 202 Shunt, Electro-magnetic 483 Shunt, Galvanometer 271, 483 Shunt, Magnetic 353 Shunt Motor 386 Shunt. Multiplying Power of a 388 Shunt Ratio 483 Shunt Winding 580 Shuttle Armature 49 Shuttle Current 483 Shuttle Winding 483, 580 Side Flash 484 Siemens and Halske's Battery 72 Siemens' Differential Voltameter 564 Siemens' Electro-dynamometer 212 Siemens' Old Armature 49 Siemens' Unit of Resistance 467 Sighted Position 484 Signaling, Velocity of 560 Signals, Electro-pneumatic 231 Signal, Telegraph 519 Silent Discharge 187, 189, 206 Silver 484 Silver Bath 484 Silver, German 277 Silver Stripping Bath 484 Silver Voltameter 565 Simple Arc 39 Simple Circuit 126 Simple Harmonic Motion 486 Simple Immersion 185 Simple Magnet 366 Simple Substitution 485 Sims-Edison Torpedo 543 Sine Curve 174, 485 Sine Galvanometer 271 Sine Law 486 Sines, Curve of 173, 485 Single Coil Dynamo 202 Single Curb Working 581 Single Fluid Theory 486 Single Fluid Voltaic Cell 486 Single Needle Telegraph 519 Single Touch, Magnetization by 359 Sinistrotorsal 486 Sinuous Current 166 Sinusoidal Curve 174, 485 Siphon Recorder 452 Sir William Thomson's Battery 72 Skin Effect 486 Skrivanow Battery 72 Sled 486 Sleeve, Joint 310 Slide, Balance 374 Slide Bridge 374 Slide Meter Bridge 486 Sliding Condenser 144 Sliding-contact Key 316 Sliding Resistance Box 463 Slope, Lines of 330 Smee's Battery 73 S. N. Code 486 Snap Switch 501 Soaking-in-and-out 486 Socket, Lamp 323 Socket, Wall 572 Soldering, Electric 487 Solenoid 487 Solenoid Ammeter 28 Solenoidal Distribution of Magnetism 358 Solenoidal Magnet 366 Solid Earth 203 Solutions, Battery, Chromic Acid 73 Solution, Chutaux's 119 Solution, Delaurier's 179 Solution, Hittorf's 289 Solution, Kookogey's 318 Solution, Poggendorf's 421 Solution, Striking 496 Solution, Tissandier's 542 Solution, Trouvé's 549 Sonometer, Hughes' 488 Sonorescence 488 Sound, Characteristics of 114 Sounder 488 Sounders, Tin 542 Sound, Quality of 444 Sound Reading 489 South Magnetic Fluid 356 Space, Clearance 489 Space, Crookes' Dark 489 Space, Dark, Faraday's 249, 489 Space, Faraday's Dark 249, 489 Space, Inter-air 489 Space, Interferric 489 Span, Polar 424 Span, Polar, Angle of the 32 Spark Arrester 489 Spark Coil 489 Spark Discharge 189 Spark, Duration of Electric 490 Spark Gap 490 Spark, Length of 490 Spark Micrometer 470 Spark Tube 491 Sparking 490 Sparking Distance 190 Sparking, Lines or Points of Least 490 Sparking, Resistance to 490 Specific Conduction Resistance 467 Specific Conductivity 145 Specific Heat 286 Specific Heat of Electricity 491 Specific Inductive Capacity 103 Specific Magnetization 361 Specific Resistance 467 Speech, Articulate 50 Speed, Critical 157 Spent Acid 491 Spent Liquor 491 Spherical Armature 49 Spherical Candle Power 101 Spherical Illuminating Power 296 Sphygmophone 491 Sphygmophone, Electric 491 Spiders 491 Spiral 492 Spiral Battery 73 Spiral, Roget's 474 Spiral Winding 492 Spirit Compass 143 Splayed Joint 311 Splice Box 492 Split Battery 73 Split Ring Commutator 141 Spluttering 492 Sponge, Platinum 419 Spot, Grease 92 Sprengel Pump 439 Spring Ammeter 28 Spring and Fibre Suspension 252 Spring-contact 148 Spring Control 492 Spring Jack Cut-out 493 Spurious Hall Effect 284 Spurious Resistance 467 Spurious Voltage 493 Square Mil 379 Square Wire 493 Squares, Law of Inverse 323 St. Elmo's Fire 494 Staggering 493 Standard Candle 101 Standard Candle, German 99 Standard, Harcourt's Pentane 406 Standard, Methven 376 Standard of Illuminating Power, Viole's 561 Standard or Main Feeder 251 Standard Quadrant 444 Standard Resistance Coil 464 Standard Voltaic Cell 109 Standard Voltaic Cell, Daniell's 109 Standard Voltaic Cell, Latimer Clark's. 110 State, Electrotonic 493 State, Nascent 389 State of Matter, Fourth 261 State, Passive 404 State, Permanent 408 Static Breeze 493 Static Condenser, Armature of 46 Static Electricity 493 Static Hysteresis 295 Static Induction, Magnetic 347 Static Shock 482 Station, Central 493 Station, Distant 493 Station, Home 493 Station, Transforming 494 Steadying Resistance 468 Steel 494 Steeling 494 Steel Yard Ammeter 28 Step-by-step Telegraph 506 Step-by-step Telegraphy 494 Step-down 494 Step, Foot- 259 Sticking 494 Stool, Insulating 305 Stopped Coil Electro-magnets 221 Stopping Off 495 Storage Battery 70 Storage Battery Changing Switch 501 Storage Battery, Planté's 72 Storage Capacity 105, 495 Storage of Electricity 495 Storms, Electric 495 Storms. Magnetic 353 Strain 495 Strain, Dielectric 183 Strain, Magnetic 354 Stranded Conductor Armature 49 Stranded Core 155 Stray Field 256, 495 Stray Power 495 Streamlets. Current 495 Strength, Dielectric 183 Strength of Magnetic Shell 352 Stress 495 Stress, Dielectric 496 Stress, Electro-magnetic 219, 496 Stress, Electrostatic 236, 496 Stress, Energy of 241 Stress, Magnetic 354 Striae, Electric 496 Striking Distance 496 Striking Solution 496 Stripping 496 Stripping Bath 57 Stripping Bath, Gold 279 Stripping Bath, Silver 484 Stroke, Back 55 Stroke or Shock of Lightning, Back 55 Stroke, Return 55 Sub-branch 496 Sub-main 496 Sub-permanent Magnetism 358 Substitution, Simple 485 Subway, Electric 496 Successive Temperatures, Law of 324 Sucking Coil 182 Sucking Magnet 366 Sulphate of Lead Battery 66 Sulphate of Mercury Battery 67 Sulphating 497 Sulphur Dioxide 497 Sulphuric Acid 497 Sulphuric Acid Voltameter 564 Sulphurous Acid Gas 497 Sunstroke, Electric 497 Superficial Density, Electric 180 Supersaturated, 497 Supply, Isolated 309 Surface 497 Surface Density 498 Surface, Equipotential 498 Surface Leakage 498 Surface Magnetization 356 Surgical Electro-magnet 222 Surging Discharge 188 Surveyors' Compass 143 Susceptibility, Magnetic 354, 359 Suspension 498 Suspension, Bifilar 498 Suspension, Fibre 252 Suspension, Knife Edge 317 Suspension, Pivot 416 Suspension, Spring and Fibre 252 Suspension, Torsion 545 Suspension Wire of Cable 97 Swaging. Electric 499 Swelling Current 167 S. W. G. 499 Swinburne Pump 440 Swinging Earth 203 Swinging or Pendulum Annunciator 35 Swiss Unit of Resistance 468 Switch 499 Switch, Automatic 500 Switch Board 500 Switch Board, Multiple 387 Switch Board, Trunking 550 Switch, Break-down 88 Switch, Changing 500 Switch, Changing Over 500 Switch, Circuit Changing 500 Switch, Double Break 500 Switch, Double Pole 500 Switch Feeder 500 Switch, Knife 501 Switch, Knife Break 501 Switch, Knife Edge 501 Switch, Multiple 501 Switch, Plug 420 Switch, Pole Changing 501 Switch, Reversing 501 Switch, Snap 501 Switch, Storage Battery Changing 501 Switch, Three Way 501 Switches, Distributing 190 Symmer's Theory 191 Sympathetic Vibration 501, 561 System, Block 83 System of Co-ordinates 150 System, Tower 545

T 501 Tailing Current 501 Tailings 501 Talk, Cross 158 Tamidine 502 Tangent Galvanometer 272 Tangent Law 502 Tangent Positions of, Gauss 276 Tangent Scale 502 Tangentially Laminated Core 155 Tank, Cable 97 Tape, Insulating 305 Tapper Key, Double 314 Teazer 504 Technica, Memoria, Ampére's 30 Tee, Lead 504 Teeth, Pacinotti 400 Tel-autograph 504 Tele-barometer, Electric 504 Telegraph, A. B. C. 504 Telegraph, Autographic 510 Telegraph, Automatic 504 Telegraph, Dial 505 Telegraph, Double Needle 506 Telegraph, Duplex 506 Telegraph, Duplex, Bridge 506 Telegraph, Duplex, Differential 507 Telegraph Embosser 237 Telegraph, Facsimile 510 Telegraph, Harmonic Multiplex 510 Telegraph. Hughes' 511 Telegraph Insulator 306 Telegraph Key 316 Telegraph, Magneto-electric 512 Telegraph, Morse 512 Telegraph, Multiplex 514 Telegraph, Single Needle 519 Telegraph, Overhouse 515 Telegraph Pole Brackets 515 Telegraph, Printing 515 Telegraph, Quadruplex 515 Telegraph Repeater 518 Telegraph Signal 519 Telegraph, Step-by-step 506 Telegraph, Wheatstone's, A. B. C. 521 Telegraph. Writing 521 Telegraphic Alphabet 19 Telegraphic Code 130, 511 Telegraphic Needle 389 Telegraphic Register 454 Telegraphy, Multiplex 388 Telegraphy, Step-by-step 494 Telemanometer, Electric 521 Telemeter, Electric 521 Telepherage 522 Telephone 522 Telephone, Bi- 524 Telephone, Capillary 525 Telephone, Carbon 525 Telephone, Chemical 526 Telephone, Electrostatic 526 Telephone Exchange 246 Telephone Induction Coil 137, 526 Telephone, Reaction 527 Telephone Record 451 Telephone, Thermo-electric 527 Telephone Tinnitus 542 Telephotography 521 Telephote 527 Telescope, Reading 450 Teleseme 527 Tele-thermometer 527 Terminal 529 Terminal Pole 529 Terminal Voltage 562 Temperature, Absolute 8 Temperature, Neutral 390 Temperatures, Laws of Successive 324 Tempering, Electric 527 Temporary Magnetism or Magnetization 357 Ten, Powers of 527 Tension 529 Tension, Disruptive 189 Tension, Electric 529 Terrestrial Magnetism 358 Tetanus, Acoustic 529 Tetrode Working 581 Theatrophone 529 Theory, Contact 148 Theory, Double Fluid 191 Theory, Franklin's 262 Theory of Dimensions 184 Theory of Light, Electro-magnetic 219 Theory of Light, Maxwell's 369 Theory of Magnetism, Ampére's 354 Theory of Magnetism, Ewing's 356 Theory of Magnetism, Hughes' 357 Theory of Magnetism, Weber's 358 Theory, Symmer's 191 Therapeutic Electrode 210 Therapeutics, Electro- 236 Therm 529 Thermaesthesiometer 530 Thermal Electric Meter 375 Thermal Equivalent, Electro- 245 Thermal Energy 242 Thermic Balance 85 Thermo Call 530 Thermo-chemical Battery 530 Thermo-chemical Equivalent 245 Thermo-electric Battery or Pile 530 Thermo-electric Call 531 Thermo-electric Couple 532 Thermo-electric Current 167 Thermo-electric Diagram 532 Thermo-electric Element 237 Thermo-electric Inversion 533 Thermo-electric Junction 533 Thermo-electric Neutral Point 390 Thermo-electric Pile, Differential 533 Thermo-electric Power 533 Thermo-electric Reversal 533 Thermo-electric Series 534 Thermo-electric Telephone 527 Thermo-electric Thermometer 535 Thermo-electricity 533 Thermo-electricity, Laws of, Becquerel's 78 Thermo-electricity, Volta's Law of 568 Thermo-electrometer 536 Thermolysis 535 Thermo-multiplier 536 Thermometer 535 Thermometer, Electric 535 Thermometer, Kinnersley's 536 Thermometer, Tele- 527 Thermometer, Thermo-electric 535 Thermophone 537 Thermostat, Electric 537 Third Brush 91 Thomson Effect 538 Thomson's Replenisher, Sir William 459 Thomson's Battery, Sir William 72 Thomson's Unit of Resistance 468 Three Filament Incandescent Lamp 322 Three Way Switch 501 Three Wire System 539 Throw 237, 540 Throw-back Indicator 540 Thrust Bearings 540 Thunder 540 Ticker 540 Tick, Magnetic 354 Timbre 444 Time Constant 541 Time Cut-outs 541 Time Electric Meter 375 Time-fall 541 Time-reaction 541 Time-rise 541 Tin 541 Tin Sounders 542 Tinnitus, Telephone 542 Tips, Polar 423 Tips, Pole 290, 426 Tissandier's Solution 542 Toeppler-Holtz Machine 334 Tongs, Cable Hanger 97 Tongs, Discharging 189 Tongue of Polarized Relay 542 Tongue of Polarized Relay, Bias of 542 Toothed Core-discs 154 Top, Magnetic 542 Torpedo, Electric 543 Torpedo, Sims-Edison 543 Torque 543 Torque, Curve of 174 Torricellian Vacuum 557 Torsion Balance, Coulomb's 544 Torsion Galvanometer 273, 544 Torsion Head 544 Torsion Suspension 545 Total Earth 203 Touch 545 Touch, Separate 479 Tourmaline 545 Tower, Electric 545 Tower System 545 Trailing Horns 259 Transformer 545 Transformer, Commuting 547 Transformer, Continuous Alternating 547 Transformer, Continuous Current 384, 547 Transformer, Core 547 Transformer, Faraday's 250 Transformer, Hedgehog 548 Transformer, Multiple 548 Transformer, Oil 548 Transformer, Pilot 415 Transformer, Series 548 Transformer. Sheath for 481 Transforming Station 494 Transformer, Welding 548, 575 Translator 519 Translucent Disc Photometer 412 Transmitter 548 Transmitter, Carbon 549 Transmission of Energy, Electric 240 Transposing 549 Transverse Electro-motive Force 549 Trap, Bug 92 Traveling Pole 426 Trembling Bell 78 Trolley 549 Trolley, Double 549 Trolley Section 549 Trough Battery 73 Trouvé's Blotting Paper Battery 73 Trouvé's Solution 549 True Contact Force 549 True Ohm 396 True Resistance 467 Trimmer, Brush 549 Trumpet, Electric 550 Trunk Lines 550 Trunking Switch Board 550 Tube, Electric 550 Tube, Guard 282 Tube, Luminous 550 Tube of Magnetic Induction 347 Tube, Spark 491 Tube, Stratification 495 Tubes, Geissler 276 Tubes of Force 261 Tubes, Plücker 420 Tubular Braid 550 Tubular Core 155 Tubular Magnet 356 Tuning Fork Circuit Breaker 121 Tuning Fork Dynamo 202 Tuning Fork, Interrupter for 307 Turning Moment 544 Turns 550 Turns, Ampere- 31 Turns, Dead, of a Dynamo 551 Turns, Primary Ampere- 551 Turns, Secondary Ampere- 551 Twist Joint, American 309 Twist, Magnetic 354 Tyer's Battery 74 Typewriter, Electric 551 Type Printer, Hughes' 511

Ultra-gaseous Matter 551 Unbuilding 552 Underground Conductor 552 Underground Electric Subway 552 Undulatory 23 Undulatory Current 167 Unidirectional 553 Uniform Field 256 Uniform Field of Force 553 Uniform Magnetic Field 345 Unipolar 553 Unipolar Armature 50, 553 Unipolar Current Induction 553 Unipolar Dynamo 202-553 Unipolar Electric Bath 57 Unipolar Induction 304 Unipolar Magnet 366 Unit 553 Unit, Absolute 554 Unit Angle 554 Unit. B. A. 554 Unit, B. A., of Resistance 462 Unit Current 167 Unit Electro-motive Force 228 Unit, Fundamental 554 Unit Jar 554 Unit Magnet Pole 366 Unit of Capacity 105 Unit of Conductivity 145 Unit of Electric Potential 432 Unit of Energy, Electro-magnetic 220 Unit of Force 261 Unit of Illumination 296 Unit of Output 399 Unit of Reluctance 458 Unit of Resistance, B. A. 78 Unit of Resistance, Breguet 463 Unit of Resistance, Digney 464 U nit of Resistance, English Absolute or Foot-second 465 Unit of Resistance, German Mile 466 Unit of Resistance, Jacobi's 466 Unit of Resistance, Meter-millimeter. 466 Unit of Resistance, Mil-foot 467 Unit of Resistance, Siemens' 467 Unit of Resistance, Swiss 468 Unit of Resistance, Thomson's 468 Unit of Resistance, Varley's 468 Unit of Self-induction 304 Unit of Supply 554 Unit of Work 581 Unit Resistance 468 Units, Circular 126, 555 Units, Derived 555 Units, Heat 288 Units, Practical 555 Universal Battery System 556 Universal Discharger 189 Unmarked End 556 Upright Galvanometer 274 Upward's Battery 75

V 556 V. A. 557 Vacuum 557 Vacuum, Absolute 557 Vacuum, High 557 Vacuum Lightning Arrester 329 Vacuum, Low 557 Vacuum, Partial 557 Vacuum, Torricellian 557 Valency 557 Valve, Electrically Controlled 558 Vapor Globe 558 Variable Conductivity 145 Variable Period 558 Variable State 558 Variation of the Compass 32, 558 Variations, Magnetic 354 Variometer 559 Varley's Battery 76 Varley's Condenser 559 Varley's Resistance 559 Varley's Unit of Resistance 468 Varnish 559 Varnish, Electric 559 Varnish, Insulating 306 Varnish, Red 559 Varnish, Shellac 481 Vat 559 Velocity 559 Velocity, Angular 32, 559 Velocity of Signaling 560 Velocity Ratio 560 Ventilation of Armature 560 Vertical Galvanometer 274 Vertical Induction 304 Verticity, Poles of 426, 560 Vibrating Bell 78 Vibration Period 560 Vibration, Sympathetic 501, 561 Vibrator, Electro-magnetic 561 Villari's Critical Value 561 Viole 562 Viole's Standard of Illuminating Power 561 Virtual Resistance 297 Viscous Hysteresis 295, 356 Vis Viva 562 Vitreous Electricity 562 Vitriol, Blue 562 Vitriol, Green 562 Vitriol, White 562 Volatilization of Carbon 108 Volt 562 Volt-ampere 573 Volt and Ampere Meter Galvanometer 274 Volt, B. A. 568 Volt, Congress 568 Volt, Coulomb 568, 573 Volt Indicator 568 Volt. Legal 568 Voltage 562 Voltage, Spurious 493 Voltage, Terminal 562 Voltaic 563 Voltaic Alternatives 563 Voltaic Arc 39 Voltaic Cell, Daniell's Standard 109 Voltaic Cell, Double Fluid 191 Voltaic Cell, Capacity of Polarization of a 103 Voltaic Cell, Single Fluid 486 Voltaic Cell, Standard 109 Voltaic Cell, Standard, Latimer Clark's 110 Voltaic Circuit 126 Voltaic Effect 563 Voltaic Electricity 563 Voltaic Element 237 Voltaic or Galvanic Battery 76 Voltaic or Galvanic Circle 119 Voltaic or Galvanic Couple 156 Voltameter 563 Voltameter, Copper 563 Voltameter, Differential, Siemens' 564 Voltameter, Faraday's 250 Voltameter, Gas 564 Voltameter, Silver 565 Voltameter, Sulphuric Acid 564 Voltameter, Volume 564 Voltameter, Weight 566 Voltametric Law 567 Volta's Battery 76 Volta's Fundamental Experiments 567 Volta's Law of Galvanic Action 568 Volta's Law of Thermo-electricity 568 Voltmeter 568 Voltmeter, Battery 569 Voltmeter, Cardew 569 Voltmeter, Electrostatic 571 Voltmeter, Reducteur for 453 Volts, Lost 571 Volume Voltameter 564 Vulcanite 571

W 572 Wall Bracket 572 Wall Socket 572 Ward 572 Waste Field 256 Water 572 Water Battery 77 Water Equivalent 572 Water Level Alarm 18 Waterproof Lamp Globe 572 Wattless Current 168 Watt 572 Watt-hour 573 Watt Meter 375 Watt-minute 573 Watt-second 573 Watts, Apparent 573 Wave Winding 580 Waves, Amplitude of 31 Waves. Electro-magnetic 573 Wax, Paraffine 402 Weber 574 Weber s Absolute Unit Resistance 468 Weber-meter 574 Weber's Theory of Magnetism 358 Wedge Cut-out 175 Wedge. Double 191 Weight, Atomic 53 Weight, Breaking 89 Weight Electrometer 223 Weight Voltameter 566 Welding, Electric 574 Welding Transformer 548, 575 Wheatstone's A. B. C. Telegraph 521 Wheatstone's Balance 577 Wheatstone's Bridge 575 Wheatstone's Bridge, Commercial 86 Wheatstone's Rheostat 472 Wheel, Phonic 409 Wheel, Reaction 259 Whirl, Electric 577 White Vitriol 562 Wilde Candle 101 Wimshurst Electric Machine 335, 577 Wimshurst Machine 335, 577 Wind, Electric 578 Windage 578 Windings, Ampere 31 Winding, Bifilar 81 Winding, Compound 578 Winding, Disc 579 Winding, Lap 579 Winding, Long Shunt 579 Winding, Long Shunt and Series 579 Winding, Multiple 579 Winding, Multipolar 579 Winding, Series 579 Winding, Series and Separate Coil 579 Winding, Series and Short Shunt 580 Winding, Short Shunt 579 Winding, Shunt 483, 580 Winding Shuttle 580 Winding, Wave 580 Winding Working, Differential 183 Wire, Block 83 Wire, Bus 94 Wire, Dead 177 Wire Finder 580 Wire Gauze Brush 92 Wire, Idle 296 Wire, Neutral 390 Wire, Omnibus 94 Wire, Square 493 Wire System, Three 539 Wires, Crossing 158 Wires, Leading-in 324 Wires, Phantom 409 Wires, Pilot 415 Wollaston Battery 78 Work 580 Work, Electric, Unit of 580 Work, Unit of 581 Working, Contraplex 580 Working, Diode 580 Working, Diplex 580 Working, Double Curb 581 Working, Hexode 581 Working, Pentode 581 Working, Reverse Current 581 Working, Single Curb 581 Working Tetrode 581 Writing Telegraph 521

X, Axis of 54

Y, Axis of 54, 397 Yoke 581

Zamboni's Dry Pile 581 Zero 581 Zero, Absolute 581 Zero Potential 432, 582 Zero, Thermometric 582 Zinc 582 Zinc Sender 582 Zincode 582 Zone, Peripolar 582 Zone, Polar 582