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Re: [Phys-L] Mesmerizing

I thought that Ze'ev did make a good point with the menstrual synchrony example: It apparently doesn't happen in humans, or at least the evidence for it is highly in doubt. 

From: brian whatcott <>
Sent: Monday, September 16, 2013 8:07 AM
Subject: Re: [Phys-L] Mesmerizing

If this is too far from Ze'ev's comfort zone, there is an everyday
example of coupling
  resonant circuits by way of very small energy increments, applied
cyclically. It's called radio for short, these days.
Or if he insists on narrowing the discussion to mechanical coupling,
there is the ever-popular instance of
foot-soldiers marching in-step across a bridge (though here, the bridge
resonances would be expected to
occupy lower frequencies.)

Brian Whatcott    Altus OK

On 9/15/2013 8:31 PM, Ze'ev Wurman wrote:
Oh yeah ... should we go to the history of hysteria too?

This is phys-l ... at least I thought so :-)

On 9/15/2013 5:17 PM, brian whatcott wrote:

my comment carefully did not limit itself to mechanically coupled
  You will recall the experimental studies of female student menstrual
cycle coupling, for example.

Brian Whatcott    Altus OK

On 9/15/2013 5:37 PM, Bernard Cleyet wrote:
On 2013, Sep 15, , at 11:04, Ze'ev Wurman <> wrote:

On 9/15/2013 8:00 AM, brian whatcott wrote:
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.

Perhaps a more careful reading would have helped you. All I wrote
is that "Much harder to achieve with electronic metronomes." Any
coupled systems will affect each other, but it is harder to get
mechanical coupling affect electronic gizmos unless they were
designed for it (e.g., mechanically coupled tuning capacitor/coil).
Read before jumping.

Forum for Physics Educators

Unavoidably easy w/ microphonic tubes.  May have been the prob. RP
solved by exchanging tubes.

Yes an e-metronome using, for example, a Wien selected tubed
oscillators, I suspect, would be subject to mechanical coupling.

bc has encountered the prob. in a more modern radio, and made an
e-metronome in the sixties.

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