Rich Grise wrote:

On Thu, 12 May 2005 23:13:10 -0500, lionslair at consolidated dot net
wrote:


DoN. Nichols wrote:


In article ,
Andy Dingley wrote:


On Thu, 12 May 2005 07:14:53 GMT, "R.H." wrote:



http://puzzlephotos.blogspot.com/

Isn't 349 a galvanometer ? I can se how I'd like it to be a motor, but
what's acting as the commutator ?


As I see it, either the off-center weight of the coil, or the
enamel is scraped off the contact wires only on one side. (I haven't
bothered saving the images and zooming in to see whether there is
sufficient detail to tell about the enamel.)

Enjoy,
DoN.


I'd say a motor myself. DC naturally.
Martin


Very much like one of these:
http://www.flinnsci.com/Documents/de...ci/PS10405.pdf

Cheers!
Rich


Good picture. My Galvanometer (it is older) model used a Horseshoe magnet that is
set and the coil is very long with a pointer. It is a very, very low current device
and was used to measure charge storage (flow) thus current. It was built by GR -
General Radio and mounted in a Fine wood case with a black plastic-like top.
Lab grade. The box is now on display at Department of Energy as an instrument
to measure the current delivered by a Hydrogen Fuel Cell that I did the tech work
for a local group (My wife was the Primary Teacher at a private school that had a grant!).

Martin


--
Martin Eastburn
@ home at Lion's Lair with our computer lionslair at consolidated dot net
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder

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