It may be that they were all once regarded as Wavemeters, i.e. for measuring wavelength, but there was a distinction that is often dropped... the Absorption Wavemeter, as opposed to the "normal" variety.

Much like a video recording almost universally referred to as a "video"... a video what? :-)


Mike

On 15/02/2017 22:54, Bob Camp wrote:
Hi

Silly Canadians :)

It seems that the term either has drifted a bit over the last 70 years or there 
is indeed
another British / US difference here.

Bob

On Feb 15, 2017, at 5:00 PM, iovane--- via time-nuts <time-nuts@febo.com> wrote:

This Canadian RCA apparatus was also called wavemeter but is a heterodyne
frequency meter and a signal generator.

https://www.pa3esy.nl/military/us/meet/TE149/html/te149_set-gb.html

iov



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