FDNY, and many other fire departments, used the Telegraph Alarm System from the later 1800s into the War Years - the 1970s. It was a system that was very reliable, although very tedious and rigid compared to today's highly technical, rapid and flexible response systems. Everyone counted the bells when an alarm was transmitted by FDNY dispatchers. Meals, kitchen stories, Giants/Dodgers/Yankees/Mets games on TV, drills, card games, exam studies - everything stopped while the bells were tapped out. Housewatch wrote each number on a chalk board. You could walk into a firehouse and see response activity by the boxes and times listed on the board. Everyone knew their response boxes so members would jump up and hustle to their turnout gear before the final the final number finished ringing. Company journal would list alarms received - RTA (Received Telegraph Alarm), time and company response. It was a time-honored system and tradition.
Preliminary Signal list:
Preliminary Signal list: