Some aspects of precision time measurements, controlled by means of piezo-electric-vibrators, as deployed in Germany, prior to 1950

This paper is based on my contribution to a Colloquium on "Time Keeping" held at Imperial College London, February 2000

Keywords: The second is the unit of time interval which is used in physics and which is the 86400th part of the everage daily rotation of the earth .... ; From lapis electricus to pieze-electricity ... ; Ceylon magnet; Pierre and Jaques Curie published ... ; Cady applied for an American Patent on 28 January 1920 ... ; Pierce ... ; Pierce-Miller oscillator ... ; Marrison .. Mason .. Hansell ... ; PTR .. ; Giebe and Scheibe .. ; Luminous quartz (Leuchtquarz) ... ; Radio-Frequenz Leuchtquarze ... ; PTR Quartz-clock development ... ; Quarz-Uhr ... ; Scheibe and Adelsberger .. ; The first statistical proof of the deviation of the daily earth rotation .. ; General Radio quartz clock C-21-H; Lothar Rohde's quartz clock type CFQ ...;  CFQ technical description ... ; DIH Hamburg ... ; Early efforts on electronic BCD counters, Rehbock (Roebuck) a very revolutionary radar-range-calibrator; Turmalin piezo-electrical-vibrators Carl Zeiss Jena, Straubel and Gerber

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