[time-nuts] General Radio frequency standard question

Tom Van Baak tvb at LeapSecond.com
Tue Nov 3 15:00:27 EST 2015

Some of you know I spend as much time looking backward as looking forward: both ends of the precision time envelope are extremely interesting -- from chronometers and tuning forks -- to cesium clocks and masers.

In particular I trying to restore and power up several old NL (Norrman Laboratories) and GR (General Radio) pre-quartz frequency standards/clocks from the 1930's. Can someone tell me if there's an active GenRad user group, web-forum, or mailing list on the web? In spite of a heavy shelf of General Radio Experimenter magazines, GR catalogs and GR manuals, I could use some help.

Replies on- or off-list are ok.

For those of you new to the 20th century history of time & frequency see mouth-watering specimens like:


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