Theo. Audel's Chapters on Telephones
A book published in 1924
A big thanks to Frank Wilsey who contributed these scans!

Click on one of the two chapters below to view/download the PDF file for that chapter.

Table of Contents

Telephones:

• Simple toy phone illustrating principle
  

• Current source
  

• Transmitter
  

• Receiver
  

• Call bells
  

• Switchboards
  

• Common battery system
  

• Party lines
  

• Telephone troubles

The Automatic Telephone:

• The system described
  

• Apparatus required
  

• Single Office Exchange:

  • General working of the automatic telephone

  • Essential elements

  • Subscriber's circuit

  • Busy test circuit

  • Private and line banks

  • Line switch and connections

  • Disconnection of line wiper during rotation

  • Disconnection of connector switch

  • Complete connector circuit

  • Clearing the called line
    

• Multi-office Systems:

  • Multi-central station dial

  • Operation of multi-office system