On 12 February 2017 at 06:08, Scott Stobbe <[email protected]> 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. > > Is there a standout methodology or instrument predating counters? > How about the diffraction grating? Natural ones have probably existed billions of years, but they were made by man in the 18th century. These are still in use today in instruments like optical spectrum analyzers. The wavemeter must have been around a long time too. These are still used at THz wavelengths. Dave. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
