Unidentified Instrument

Discussion in 'Aviation' started by Gagar, Aug 20, 2010.

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  1. Gagar

    Gagar New Member

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    #1 Gagar, Aug 20, 2010
    Last edited: Aug 21, 2010
    Newbie here. (Sorry for the previous large images)
    My late husband worked for Sperry during WWII and collected several instruments while he worked on bomb sites. I have been able to identify all but one. The attachment does not show everything. Besides the obvious numeral "4", in black font on the left is a "0" of the same size and on the right is "8". In between, are smaller black font hash marks. There are no electrical wires protruding so one would probably conclude it is hydraulic in nature. No other markings are found on the instrument. Thanks for any clues.
     

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  2. Nikademus

    Nikademus Member

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    ack! big picture
     

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  3. Night Fighter Nut

    Night Fighter Nut Well-Known Member

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    It actually lookes familiar to me but I can't quite place it. I would agree that it looks like it might be hydraulic in nature but perhaps it could also be pneumatic. What does it look like on edge?
     
  4. T Bolt

    T Bolt Well-Known Member

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    my guess would be vacuum driven.
     
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