[time-nuts] NPR story on coupled pendulums

Bill Hawkins bill at iaxs.net
Wed Jul 29 18:44:19 UTC 2015


They talk about sound pulses affecting the pendulums.

Sounds more likely that the mechanical vibration transmitted through the
aluminum bar affects the escapements.

Perhaps the 'tock' side generates the strongest pulse, and the 'tick'
side is sensitive enough to be affected by that pulse.

That would soon have the clocks synchronized out of phase, provided the
mounting arrangement did not absorb too much of the pulse energy.

The situation is similar to synchronizing a TV vertical oscillator
(running a bit slow) with the received sync pulse from the broadcast
station, no?

Bill Hawkins


-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Hal
Murray
Sent: Tuesday, July 28, 2015 10:55 PM
To: time-nuts at febo.com
Cc: Hal Murray
Subject: [time-nuts] NPR story on coupled pendulums

University Of Lisbon Scientists Solve Pendulum Clock Mystery

Two professors at the University of Lisbon say they have discovered why
the pendulums of clocks set on the same surface will eventually swing
together in opposing directions.

http://www.npr.org/2015/07/28/427178282/university-of-lisbon-scientists-
solve-
pendulum-clock-mystery

I thought the NPR story was not very interesting.  (But it probably
wasn't targeted at time-nuts. :)

----------

Here is the paper:
  Huygens synchronization of two clocks
  http://www.nature.com/srep/2015/150723/srep11548/full/srep11548.html


--
These are my opinions.  I hate spam.



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