> The man made a quarts crystal oscillator that sent a pulse to an electromagnet > that was placed near a permanent magnet mounted on the pendulum of a wall (not > a grandfather) clock. The pendulum was set a bit slow for its 72 per minuet > beat and the electronics gave it a push each cycle to make it swing at the > correct rate.
For a modern treatment of this see Bryan Mumford's excellent web site: http://www.bmumford.com/clocks/index.html Those of you time-nuts who also keep "real" clocks in addition to atomic clocks you'll find his Microset timer an excellent way to track the performance of your chronometers and pendulum clocks: http://www.bmumford.com/microset.html One last thing I should point out is that for every person on this "electronic timekeeping" time-nuts list there are a hundred old guys out there who collect old mechanical clocks and watches. They are members of the NAWCC (National Association of Watch and Clock Collectors). A small subset are NAWCC Horological Science Chapter #161. This is a group of modern pendulum clock makers and are driven more by the amazingly deep science and technology of vintage and modern precision pendulum clocks than the art and fashion of wristwatches. See also: Horological Science Newsletter http://www.ubr.com/clocks/nawcc/hsc/hsn.html Horological Science Issue Index http://www.iinet.com/~holmstro/hsnissueindex.php Subject Index to Horological Science Newsletter http://www.horology.com/hip-hsin.html /tvb http://www.leapsecond.com/time-nuts.htm _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
