A Convenient Method for Referring Secondary Frequency Standards to a Standard Time Interval
Larry M. Hull, J.K. Clapp · Proceedings of the IRE · 1929
A method is described for obtaining a convenient low frequency from a high-frequency standard by means of harmonic control of distorted wave oscillators (multi-vibrators). In the equipment described two such oscillators are employed, for convenience in arriving at a harmonic series of frequencies, based on 10-kc fundamental, as well as a frequency of 1 kc for operation of the clock motor, from a standard frequency of 50 kc. The conclusions based upon an experimental investigation of harmonic control of the distorted wave oscillators are given. Representative curves of the variations in frequency of the 50-kc standard for 10-day intervals are shown.