Hi One would assume that the rest of the world also made a few crystals during the same period. Bob On Aug 1, 2013, at 10:41 PM, "Charles P. Steinmetz" <charles_steinmetz@lavabit.com> wrote: > pete wrote: > >> I can't find it but I saw a reference to how may units were made during >> WWII, does anyone have the number and the reference ? > > "The total number of QCU's produced by all manufacturers during the war is difficult to ascertain; estimates have ranged from 30 million to over 70 million QCUs produced by American manufacturers between 1941 and 1945." > > McGahey, Dissertation, "HARNESSING NATURE'S TIMEKEEPER: A HISTORY OF THE PIEZOELECTRIC > QUARTZ CRYSTAL TECHNOLOGICAL COMMUNITY (1880-1959)" (Georgia Institute of Technology, 2009), 253 <http://smartech.gatech.edu/bitstream/1853/28255/1/mcgahey_christopher_s_200905_phd.pdf> [citing Virgil E. Bottom, "A History of the Quartz Crystal Industry in the USA" (Proceedings of the 35th Annual Frequency Control Symposium, Philadelphia, PA, 27-29 May 1981), 3-12; and Richard J. Thompson Jr., Crystal Clear: The Struggle for Reliable Communications Technology in World War 2 (New York: Wiley-IEEE Press, 2006), 163-4.] > > Best regards, > > Charles > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.