Category: Science - Physics

Home-made Electrical Apparatus

How to Make a Pole Changing Switch or Current Reverses How to Reverse a Small Motor. .......................................... How to Make a Small Battery Rheostat for Regulating the Speed of Small Motors, Etc. ..............................................

Chapters

8. CHAPTER II. CELLS AND BATTERIES.

Only those who are so fortunate as to live in a house wired for light and power service and supplied from the street mains, are likely to be able to utilize the first named. Tho...

7. CHAPTER I. STATIC ELECTRICAL APPARATUS

*Static Electricity* is an extremely interesting subject for the amateur experimenter, in view of the many spectacular experiments which may be performed with it. The number of...

17. CHAPTER XI. THE CONSTRUCTION OF SPARK COILS.

A Spark Coil is one of the most interesting pieces of apparatus that an experimenter can possess. Not only can it be used to transmit wireless messages, but numerous and various...

25. CHAPTER XIX. MISCELLANEOUS EXPERIMENTS AND APPARATUS.

Liquid which will conduct a current of electricity is called an *electrolyte*. All electrolytes are compounds, that is, they consist of more than one substance. When an electric...

6. CHAPTER XIX. MISCELLANEOUS EXPERIMENTS AND APPARATUS. .............

FIG. 1.—A simple Wimshurst Machine which any boy can easily make. P P, Plates; BR, Neutralizes; C R, Collectors; DR, Discharge Rods; J J, Leyden Jars; H H, Insulating Handles; C...

20. CHAPTER XIV. HOW TO BUILD AN ELECTRIC ENGINE.

An Electric engine is really a form of electric motor but differs from the most common form of the latter in that the armature, instead of revolving, oscillates back and forth,...

14. CHAPTER VIII. HOW TO MAKE A TELEGRAPH KEY AND SOUNDER AND INSTALL A

1. A battery which produces the electric current. 2. A wire to conduct the current from one point to another. 3. A key or switch for turning the current off and on. 4. An electr...

24. CHAPTER XVIII. AN EXPERIMENTAL WIRELESS TELEPHONE.

Many of the readers of this book are probably "wireless experimenters" who have constructed their own wireless telegraph apparatus, but not many have ever built a wireless telep...

16. CHAPTER X. MEDICAL COILS AND SHOCKING COILS.

Medical coils and "shocking coils" are the same. The term "shocking coil" is usually applied to the low priced medical coils which most boys are familiar with for giving "shocks".

15. CHAPTER IX. HOW TO MAKE AND INSTALL A TELEPHONE.

Not many years ago, the telephone was the wonder of the times just as the aeroplane and the wireless are to-day. The original telephone apparatus was an exceedingly crude and si...

21. CHAPTER XV. MINIATURE BATTERY LIGHTING.

The tungsten lamp uses less than one third the amount of current required by the old-fashioned carbon filament lamps in producing the same candle power. This means that the batt...

12. CHAPTER VI. ELECTRIC MEASURING INSTRUMENTS

If several turns of wire are wrapped about a compass, and a current of electricity sent through the coil, the compass needle will be deflected. Such an instrument is called a *g...

13. CHAPTER VII. CURRENT CONTROL DEVICES.

The switch shown in Figure 76 is a very simple device which will be found very handy for many purposes. It consists of two brass levers mounted alongside of each other and conne...

18. CHAPTER XII. HOW TO MAKE A DYNAMO-MOTOR

It is very difficult to construct a first class dynamo without resort to the materials and methods employed in the manufacture of commercial machines. The necessity for careful...

11. CHAPTER V. HOW TO BUILD A STEP-DOWN TRANSFORMER FOR REDUCING THE 110

A Step-Down Transformer will reduce the 110 volt alternating current to a low voltage. These low voltage currents are still alternating but will operate almost all sorts of dire...

22. CHAPTER XVI. COHERER OUTFITS FOR WIRELESS TELEGRAPHY.

MANY experimenters desire some device by which wireless signals may be made clearly audible without the necessity of holding a telephone receiver to the ear. It is not possible...

19. CHAPTER XIII. AN ELECTRIC BATTERY MOTOR.

The field frame and armature of the motor shown in Figure 133 are laminated, that is, built up of separate sheets of iron. They may be made out of sheet tin or ordinary stove pi...

10. CHAPTER IV. HOW AN ALTERNATING CURRENT MAY BE CHANGED INTO DIRECT

Oftentimes the only source of electrical energy for experimental work is the 110 volt alternating current supply. This may be reduced to a voltage suitable for operating small b...

23. CHAPTER XVII. HOW TO BUILD A TESLA HIGH FREQUENCY COIL.

IF the discharge from a Leyden jar or a condenser is passed through a coil of wire acting as a primary and the primary is provided with a secondary coil of a larger number of tu...

30. Chapter V.—ARRANGEMENT AND OPERATION OF THE APPARATUS. Aerial Switches.

1.—Magnetism. 2.—Magnetic Induction. 3.—Primary and Secondary Cells. 4.—Electric Currents. 5.—Electromagnetism. 6.—Dynamo-Electric Machinery. 7.—The Induction Coil. 8.—The Trans...

9. CHAPTER III. HOW TO REDUCE THE 110 V. D.C. OR A.C. TO A LOWER VOLTAGE

It is often desirable to operate experimental apparatus and other electrical devices from the 110 volt lighting circuit. Such a circuit may be either direct or alternating, comm...

40. Chapter XIX—MISCELLANEOUS APPARATUS. Electrolysis of Water.

We have received so many requests from our customers for information as to where they may obtain some of the materials required to build the apparatus described in this book, th...

36. Chapter VIII.—*HOW TO CONNECT AND OPERATE THE APPARATUS*. How to connect

The Book you are now reading is only the first volume of "Home-made Electrical Apparatus." Written in a very clear and simple style, the other volumes are invaluable to the youn...

5. CHAPTER XI. THE CONSTRUCTION OF SPARK COILS. ......................

Experiment 1—An Imitation Gassiot’s Cascade. .................... Experiment 2—A Ghostly Light .................................... Experiment 3—Lighting Geissler Tubes. ..........

34. Chapter IV.—*HOW TO BUILD THE SIMPLEX LOOSE COUPLER, DETECTOR AND

CONDENSER*. The base; the primary; the secondary; the pillar; the switch; How to make the Simplex cat whisker detector; How to make the Simplex fixed condenser; How to connect t...

4. CHAPTER VII. CURRENT CONTROL DEVICES. .............................

How to Make a Pole Changing Switch or Current Reverses How to Reverse a Small Motor. .......................................... How to Make a Small Battery Rheostat for Regulati...

2. CHAPTER II. CELLS AND BATTERIES. ..................................

27. Chapter II.—SPARK COILS. The Construction of Spark Coils. A 1/4-inch

29. Chapter IV.—THE RECEIVING APPARATUS AND ITS CONSTRUCTION. A Silicon

26. Chapter I.—THE AERIAL. The Location of the Station. The Construction of

31. Chapter I.—*WIRELESS TELEGRAPHY*. An intensely interesting subject;

33. Chapter III.—*HOW TO BUILD AND OPERATE THE SIMPLEX DOUBLE SLIDE

32. Chapter II.—*AERIALS AND GROUNDS*. Where to put up the aerial; types of

3. CHAPTER VI. ELECTRIC MEASURING INSTRUMENTS ........................

35. Chapter VI.—*HOW TO BUILD THE SIMPLEX SPARK COIL.* The core; the

28. Chapter III.—TRANSMITTING APPARATUS AND ITS CONSTRUCTION. Step-down

1. CHAPTER I. STATIC ELECTRICAL APPARATUS ............................

39. Chapter XI—THE CONSTRUCTION OF SPARK COILS. A one-quarter inch Coil, a

37. Chapter VII—CURRENT CONTROL DEVICES. How to Make a Pole Changing Switch

38. Chapter VIII—HOW TO MAKE A TELEGRAPH KEY AND SOUNDER. How to Install a