TELECOM Digest OnLine - Sorted: Re: Pre A/C Central Office Ventilation?

Re: Pre A/C Central Office Ventilation?

Jim Haynes (
Fri, 14 Jul 2006 01:52:08 GMT

I remember a couple of telephone offices in southern Arkansas in the
40s and 50s. The first one was a manual office on the second floor of
a building. As someone mentioned there were high ceilings - about 16
feet in this case. There were windows that could be opened, and in
the switchboard room there were oscillating fans mounted on the walls.
In old buildings you sometimes see fan outlets high up on the walls;
you can recognize them by the large bolt they have to hold the fan.
There was not much electronics in this office. Maybe 3 channels of H1
carrier with maybe 4 tubes each. Tungar rectifiers to charge the
batteries. Later there was added a program amplifier for radio
networking, a 48 volt power system, a few 24 volt rectifiers, and a
mobile radiotelephone setup which included a 250 watt transmitter and
a receiver with a bunch of tubes. Of course the transmitter was not
used much, so only keeping the tubes heated generated heat.

Then there was a SxS office on a one-floor building in the early
1950s. I'm trying to remember if it had A/C in the switchboard area
from the beginning. Possibly in the business office too. The
equipment room did not get A/C until fairly late, when a bunch of O
and N carrier equipment came in.

jhhaynes at earthlink dot net

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