Abstract :
Piezo-electric wave length standards of the quartz or quartz-steel types previously described by the author have been compared with standard wave meters or multi-vibrators in the United States, Italy, France, and England. Six standards were used, of frequencies ranging from 14 to 1,500 kilocycles. The methods of comparison are described, and data obtained at the various laboratories presented. The tabulated results show that the average deviation from the weighted means, for all comparisons, is about 0.1 percent. It is shown that by the simplest methods of comparison a precision of 0.1 percent is attained, while in a comparison with the multi-vibrator, by more elaborate means, the precision is a few parts in 100,000.
