[time-nuts] Vintage Frequency Measurement

[Dan Rae]

On 2/11/2017 10:08 PM, Scott Stobbe wrote:
> I was inspired recently coming across a Lampkin 105 frequency meter, as to
> how  frequency measurement was done before counters.
>
> Certainly zero-beating a dial calibrated oscillator, would be one approach.
>
>
Google BC-221 and you may get some idea of how those worked.  I just 
wish I could find the one hidden in my garage :^)

Dan