| Fig. 121. | Fig. 122. |
| Fig. 123. | Fig. 124. |
118. Electric Buzzers have the same general construction as electric bells; in fact, you will have a buzzer by removing the bell from an ordinary electric bell. Buzzers are used in places where the loud sound of a bell would be objectionable. Fig. 124 shows the usual form of buzzers, the cover being removed.
CHAPTER XVI.
THE TELEPHONE, AND HOW IT TRANSMITS SPEECH.
119. The Telephone is an instrument for reproducing sounds at a distance, and electricity is the agent by which this is generally accomplished. The part spoken to is called the transmitter, and the part which gives sound out again is called the receiver. Sound itself does not pass over the line. While the same apparatus can be used for both transmitter and receiver, they are generally different in construction to get the best results.
| Fig. 125. | Fig. 126. |
Fig. 127.
120. The Bell or Magneto-transmitter generates its own current, and is, strictly speaking, a dynamo that is run by the voice. It depends upon induction for its action.