[time-nuts] General Radio frequency standard question

Brooke Clarke brooke at pacific.net
Tue Nov 3 15:32:13 EST 2015

Hi Tom:


http://www.prc68.com/I/GR650A.shtml & 1650

Mail_Attachment --
Have Fun,

Brooke Clarke
Tom Van Baak wrote:
> 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:
> http://leapsecond.com/museum/gr1103a/
> http://leapsecond.com/museum/gr1190a/
> http://leapsecond.com/museum/gr676b-50kc/
> http://leapsecond.com/museum/gr815b/
> http://leapsecond.com/pages/old-genrad/
> Thanks,
> /tvb
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