pdp1@EARTHLINK.NET on sun 4 jan 04
Hi Mel, all...
I forget just 'when'...but the bi-metallic propensity for
differential bending in response to temperature changes, was
employed in the peripheries of the Balance Wheels of Pocket
Watches, I think in the latter Seventeen Hundreds...where,
to compensate for changes in temperature, the effective
radius of the Balance Wheel would adjust to slow or hasten
the cycle of the Wheel's periodicity...
The rims of which Wheels were as two mirror image letter "C"
forms, connected at one of their legs to a spoke, so the
other leg or end was free to move out or in...
Similarly, in a way, a visual gauge for an analoge of
Humidity may be made as uses two species of Wood, thin and
glued to gether as strips, whose differeng response to
ambient humidity levels will oblige them to bend one way or
the other...
Anyway...little spin offs...
Phil
lasvegas
----- Original Message -----
From: "mel jacobson"
> we have had some luck with getting those bi/metal
> thermocouples together with oxy/acet welding.
> we just use a big gob of borax on the tip.
> get it hot, let it turn to glass, then it sorta melts
together.
>
> this is a home remedy fix.
>
> often, the only way to get them together, without
> exotic welding equipment.
> others may have other solutions.
>
> it is amazing what our gang at `hay creek` can come up
> with when pressed by need.
>
> my first experience with bimetal technology was the old
time
> automatic choke. it was bimetal/ in spring form...when
hot it would
> uncoil, cold, it would coil. i remember showing that to
kids
> in class...we would use the burn-zo-matic torch , had an
old
> choke from the auto shop...i don't know
> how that got started, but it was fun to see. also
> had them hold up a piece of kaowool board and i would try
> and get their hands hot on the other side. `hey mel,
> burn my buddies hand` of course they would be shocked and
> surprised. `wow, is that a space shuttle tile?` `yup`.
> mel
> i remember the day i had to explain `hemi`...the engine.
> that went on for a week...all kinds of kids showed up and
> got in on that discussion. drawings all over the art
room.
> drawing, visual language.
>
>
>
>
> From:
> Minnetonka, Minnesota, U.S.A.
> web site: my.pclink.com/~melpots
> or try: http://www.pclink.com/melpots
> new/ http://www.rid-a-tick.com
>
>
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Odin Maxwell on tue 6 jan 04
On Sun, 4 Jan 2004 20:18:23 -0800, pdp1@EARTHLINK.NET wrote:
>Similarly, in a way, a visual gauge for an analoge of
>Humidity may be made as uses two species of Wood, thin and
>glued to gether as strips, whose differeng response to
>ambient humidity levels will oblige them to bend one way or
>the other...
Oh this sounds too fun to let go - any specifics on what varieties of wood
work best? I just gotta try this. ;-)
om
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