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On 2013, Sep 15, , at 08:00, brian whatcott <betwys1@sbcglobal.net> wrote:It was found that observatory pendulum mounts were a significant source of error. The remedy for this mount compliance was the use of a short stiff beam mount for two pendula in phase opposition - which reduced or eliminated the effect. Engineers are familiar with the virtues of the Boxer engine configuration, like the original VW bug engines which bled up into the Porsche,as well as the Lycoming and Continental air-cooled reciprocating engines, for a somewhat similar reason. It was a short hop from the dual pendulum to the electrically maintained vibrating fork, which led to the quartz tuning fork configuration, before timing frequencies went higher with simpler quartz slab configurations. All in just a lifetime....
Not only 'appears to be' but it's specified with the video clip that a compliant mount encourages synchronization. Actually, it is found that very small amounts of energy applied cyclically, will eventually synchronize devices which share a resonant frequency. Applies to electronic devices too, despite Z'ev's misgivings.
Brian Whatcott Altus OK
cut
project for bc??
two relaxation oscillators (RC and NE-2 lamp) connected with a resistor??
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" Was it possible that this motion could traverse the 10 or 15 feet between them and retard the swing of the experimental pendulum, drawing energy out of it, decreasing the amplitude, and increasing the rate?"
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I suspect the movement of the wall supporting the clocks was less than a micron.
The quote is from the second experiment in:
Pendulums That Interfere
http://www.bmumford.com/clocks/tech/2clocks/2clocks.html
bc
more from the page:
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For reference:
Both clocks are fastened to the wall. The Self Winding is bolted very solidly top and bottom. The experimental clock just hangs on a bracket from a single bolt in the wall. The wall is an interior load bearing wall, with wooden studs and drywall sheeting. The wall stands on a poured concrete footing directly beneath it.
Bryan Mumford
Santa Barbara, California
August 25, 1998