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Ambrose Shardlow measuring thingy?

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Tools and Hardware303 of 9155more doorknobs and a castertwo BOSS WRAPPING TWINE spools
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    Posted 6 months ago

    (176 items)

    This one has me stumped I know what micrometers are must have 50+ (yeah I collect machinist tools too but I do use some as I have a lathe and milling machine that I try to convince myself I know what I'm doing with) but Mr Google doesn't seem to acknowledge it's existence, . Has Ambrose Shardlow & Co LTD Sheffield England on the thimble but nothing else no model number nada. To measure between the anvils you turn the thimble counter clockwise and then it springs back slowly to closed letting you measure the thickness on the dial which appears to be calibrated in thousands of an inch. The back outer ring on the dial can be turned so the red mark can be set to a particular measurement almost like you would be checking for a particular setting. The gap is too small for checking brake discs maybe it's for checking sheet metal by a quality control guy.......any ideas anyone? Oh and it's 9 3/4" long, yes measured in imperial figures!

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    1. dav2no1 dav2no1, 6 months ago
      It definitely has a long reach, like you would be checking consistency over a large area?
    2. BHIFOS BHIFOS, 6 months ago
      Yes or trying to get off the edge where the thickness might not be so regular.
    3. hotairfan hotairfan, 6 months ago
      My guess is that it is a sort of micrometer, but one that was not used for general purpose (obviously), but for periodic testing in production use

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