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Thread: Mystery Rev Counter/Tach with Totalizer

  1. #1
    Join Date
    Apr 2013
    Location
    SF Bay Area, CA USA
    Posts
    15

    Mystery Rev Counter/Tach with Totalizer

    Hi All,

    Just tapping into the collective intellectual horsepower of the community....

    I've come across an Air Ministry Mk IA tachometer, 60/223 (serial 134/42), made by Smiths & Sons that I've not seen before.
    The most unique feature is what I'll call a "totalizing" feature, which appears to display the cumulative revs of the engine, up to millions.
    It perhaps acts as an engine hourmeter for the purpose of maintenance interval tracking. I've not found any references to the numbers labeled on this tachometer.

    Has anyone seen this before, and are there any ideas as to the specific aircraft (or laboratory?) which may have used this indicator?

    Help is appreciated!

    JT


    JT
    2BanAviator
    AeroAntique.com
    Preserving Warbird History...one artifact at a time.

  2. #2
    Join Date
    Apr 2013
    Location
    SF Bay Area, CA USA
    Posts
    15
    Just wanted all to know that this tachometer was ID'd by a colleague who corrected my reading of the Air Ministry stores ref number: it wasn't 60/223, but 6C/223, and the C designates it as test equipment. So it is unlikely to have ever appeared in an aircraft, but may have been used in an aircraft development or field service facility.

    Just wanted to close the loop on this query!
    JT
    2BanAviator
    AeroAntique.com
    Preserving Warbird History...one artifact at a time.

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