Another nice example of "before there were frequency counters":
"Methods of using standard-frequency radio transmissions", 1934
http://tf.nist.gov/general/pdf/2423.pdf
"Recent developments in precision time-keeping", 1934
http://leapsecond.com/pend/pdf/1934-Tomlinson-Recent-Developments-Timekeeping.pdf
via http://adsabs.harvard.edu/full/1934Obs....57..189T
/tvb
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