FIRE-ALARM CALLS SENT OUT WITH PERFORATED PLATES (May, 1924)

FIRE-ALARM CALLS SENT OUT WITH PERFORATED PLATES

By means of perforated plates fitted into the transmitting apparatus in the fire telegraph dispatching equipment of the new central station in the Bronx, New York City, alarms are relayed automatically to outlying stations. Simultaneous signals are sounded in a number of fire houses by means of electric connections formed when current is sent through the plates.

2 comments
  1. jayessell says: May 5, 20085:18 am

    It’s a punch card?

  2. Matt says: May 6, 20088:46 pm

    It’s a punch card, but made out of metal so it lasts longer. See page 48 of http://www.tinaja.com/g… , under the “LAN of the Eighties” heading, for a little more information on this system.

Submit comment

You must be logged in to post a comment.