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This video shows an old Aneroid barometer that I picked up at the Teifi Valley Vintage Preservation Society's 28th "STEAM & VINTAGE" Show 30th May 2011 The Barometer's 8 inch dial is march Walter Bushnell Calcutta & Simla The pointers return spring had completely rusted away in several places but I have repaired it with the spring from a balance wheel from an old clock that I had taken to pieces some years ago. I wasn't setting out to carry out a faithful restoration; I was simply setting out to see if I could breathe some life back into the old instrument. As an inventor I have designed a lot of special purpose machines and I have designed, built and sold machines that have been used in the manufacture of capsules for aneroid barometers and barometric sensors used in ejector seats but I have never owned a barometer. I love tinkering and fixing things and I think that now I've got this barometer working I might modify the case and just have a round dial, but that's for another days playing. The spring I used in the video was back tempered by putting it on a hotplate (cooker) with some silver foil over it for a few minutes. Not very technical I know but all my working live I've had to be precise, now I can please myself and the spring was adequately "let down" for my needs. By the way pressurizing the air in a plastic bag the way I do in this video is only a guide to the fact that the capsule is working if there were the tiniest of tiny holes in the joints or body of the capsule it may still respond to quick changes of pressure but would never track the slowly changing weather conditions. Here are some links to a mercury wheel barometer that I fixed Here's a link to this video • Barometer...A quick look at how I rem... Here's a link to part 1 • Part 1 of 2 fixing a mercury wheel ba... Here's a link to part 2 • Part 2 of 2 fixing a mercury wheel b... Thanks for watching, I love to hear your comments. Kind Regards ... Andy