CHAPTER XIII

ELECTRICITY 305

Incandescent Electric Lamps--The Mazda Lamp--Candlepower--Lamp Labels--Illumination--The Foot-candle--The Lumen--Reflectors--Choice of Reflector--Lamp Transformers--Units of Electrical Measurements--Miniature Lamps--Effects of Voltage Variations--Turn-down Electric Lamps--The Dim-a-lite--Gas-filled Lamps--Daylight Lamps--Miniature Tungsten Lamps--Flash Lights--The Electric Flat-iron--The Electric Toaster--Motors, Fuse Plugs--Electric Heaters--Intercommunicating Telephones--Electric Signals--Buzzers--Burglar Alarms--Annunciators--Table Pushes--Bell-ringing Transformers--The Recording Wattmeter--To Read the Meter--State Regulation of Meter Service--Electric Batteries--Battery Formation--Battery Testers--Electric Conductors--Lamp Cord--Portable Cord--Annunciator Wire--Private Electric Generating Plants--Storage Batteries--The Pilot Cell--National Electrical Code--Electric Light Wiring--Outlet Boxes--Automatic Door Switch--Plug Receptacles--Heater Switch, Pilot and Receptacle--Service Switch--Local Switches--Pilot Lights--Wall and Ceiling Sockets--Drop Lights.

INDEX 385

MECHANICS OF THE HOUSEHOLD