[time-nuts] Sputnik and the HP 523B counter

Murray Greenman murray at rakon.co.nz
Thu Oct 4 13:36:38 EDT 2007

The HP Journal link about Sputnick mentioned today
http://www.hparchive.com/Journals/HPJ-1957-09-Sputnik.pdf reminds me
that the HP 523B counter used a Meacham Bridge oscillator as its

I've several references -


L.A. Meacham's patent in 1938 was also the earliest mention I know of
which include a lamp as a PTC amplitude stabilizer.

No doubt you've all read Rick's papers about the HP E1938A which uses a
bridge oscillator. A few more bits in it than Meacham's original, or the
HP 523B!

Murray ZL1BPU

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