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    Re: Ratiometer
    From: Alan S
    Date: 2011 Feb 9, 10:06 -0800

    Re that this device is or might be, an acquaintance offered the following:

    1. I have shown the image to my grandfather and he feels that it is likely a solar line of sight compass.

    2. The thought also occurs that it may be a device for calculating rate or estimating speed/time of a course or leg.

    3. Well from a cursory examination of the illustration i would tend to think that it might be a device for converting scale ratios on maps, or perhaps to convert scalar distances to NM or Km etc...

    I have no idea myself, so I suppose that one might "take their pick".

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