[time-nuts] Spectracom 8170 -> SWCC clock
jxh at jxh.com
Sat Jan 21 21:03:30 EST 2012
Exellent intel, thanks! The face has a penciled legend "I C Depot" which I suppose stands for Illinois Central, the railroad. But I would think mine works the same way as all the others. The coil holds down a follower against a cam, so the :59:59 thing makes sense. I will check this out by just doing it with a button at first.
On Jan 21, 2012, at 9:25, Brucekareen at aol.com wrote:
> If your Western Union clock is similar to the type used in broadcasting,
> you might want a setting pulse that starts at 59:59 and ends at 00:00 . The
> reason is that at 59:59 the magnet pulls the second hand to the 12 o'clock
> position and releases it on the hour. The one-second difference might seem
> trivial, but it's actually about three words for an announcer beginning a
> network broadcast.
> When Western Union got out of the clock business in the late 1970s
> (following a technician strike where the master clocks were ignored and service
> deteriorated) the company I worked for purchased the clock installation from
> Western Union (for $75 per clock as I remember) and we installed a digital
> master system. The Western Union clocks were all connected in series and
> driven as a constant-current teletype type loop. We had wire-wrap logic
> panels associated with the digital master time system. Signals for the W. U.
> clocks, for alerting control rooms before newscasts, starting recordings,
> etc., were implemented by simply adding chips, DIP relays, 14/16-pin boards
> with components such as timing capacitors, and wire-wraping the underside
> pins. I/O was implemented with those 14 and 16-pin DIP connectors on one
> end of ribbon cables -- the other ends being terminated on barrier strips on
> rack wall panels.
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