On 26/06/13 17:12, Nick wrote:
"thescullster" wrote in message
...
Hi all

I have come by an old barometer - something like the item shown here
http://www.hemswell-antiques.com/ant...ter-33028.html
(although not quite of the quality).
Now I know that these devices measure atmospheric pressure, but I am not
clear on how much this will be affected by the instrument location.

Does a heat source like a radiator change atmospheric pressure?
Can I mount this on a wall above a radiator and expect it to work?

From my memory of the barometer, the needle doesn't appear to move much in
operation. Is this because it was previously in a centrally heated house,
or is there likely to be something wrong here?

Location will not affect the baro, but it will affect the thermometer and
possibly the wood.
Don't know much of aneroids, prefer mercury.
As regards movement of the needle.
Set baro in desired position. Align the cursor with the hand. Repeat at 10am
every day of course.
Note the movement of the hand over a 24hr period.
If the swing is 30 deg or more- Sun hat if up, raincoat, hat & wellies if
it's down. Do you have a dinghy?
Just keep an eye on it for a few days. I suspect most aneroid baros would
not be repairable. TBH, they're not worth it.

I did repair one I got at auction. REMARKABLY similar to that.

It turned out there was a little teeny bicycle chain inside it that
connected the capsule to the pointer shaft and that was all rusted up.
Some easing oil and brushing with paraffin got it all cleaned up and
free, then it got some very light machine oil.



I think the seller of the item you show is utterly and completely off
trolley. Delete the first number, divide the remainder by two and you might
be in the real world.
hth Nick.
i think I had to bid against another nutter like me and i paid 85 quid.

I like **** like that.





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Ineptocracy

(in-ep-toc-ra-cy) €“ a system of government where the least capable to lead are elected by the least capable of producing, and where the members of society least likely to sustain themselves or succeed, are rewarded with goods and services paid for by the confiscated wealth of a diminishing number of producers.