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Re: A Simple Lab Demo of Resistor Noise EMF.



Actually, "taut-band" is the usual description for the way a pivotless
meter construction holds a moving coil in the field, for example.
The term is also used for an optical shutter pivotless construction.

In contrast, a hot wire ammeter may well feature an orthodox
jeweled pointer pivot.
Here's a current offering in the former category.

<http://www.beede.com/panel_meters_magcentric_taut_band_b_c.htm>

Brian

At 10:34 3/21/01 -0500, you wrote:
This is called the "taut wire" ammeter. A stretched wire, with attached
pointer, carried the current. The wire changed length in response to I^2R
heating.

Bob Sciamanda

-----------
There was another instrument in the same general class:
the hot wire ammeter relied on the sag caused by current
through a fine wire to provide a pointer deflection.
It was indifferent to the current direction.
brian whatcott
brian whatcott <inet@intellisys.net> Altus OK
Eureka!