CHAPTER XXVII. APPLICATIONS OF ELECTRICITY 192

Things Electricity Can Do.--Exp. 191, To study the action of a simple telegraph sounder.--Discussion.--Telegraph Line; Connections.--Operation of Line.--Exp. 192, To study the action of the "relay" on telegraph lines.--The Relay.--Exp. 193, To study the action of a two-pole telegraph instrument.--Exp. 194, To study the action of a simple "single needle telegraph instrument."--Exp. 195, To study the action of a simple automatic contact breaker, or current interrupter.--Automatic Current Interrupters.--Exp. 196, To study the action of a simple electric bell, or a "buzzer."--Electric Bells and Buzzers.--Exp. 197, To study the action of a simple telegraph "recorder."--Exp. 198, To study the action of a simple "annunciator."--Discussion.--Exp. 199, To study the shocking effects of the "extra current." Induction Coils.--Action of Induction Coils.--Transformers.--The Dynamo.--The Electric Motor.--Exp. 200, To study the action of the telephone.--The Telephone.--The Bell, or Magneto-transmitter.--The Receiver.--The Carbon Transmitter.--Induction Coils in Telephone Work.--Electric Lighting and Heating.--Arc Lamps.--The Incandescent Lamp.