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    Computing Instrument
    From: Johannis Geelhoed
    Date: 2010 Feb 3, 13:03 -0800

    Looking though my recently acquired 1938 version of Bowditch HO-9, I found a picture of an item called a computing device. (See linked image).

    The description on the previous page reads as follows:
    "Figure 52 represents one of the instruments that has been devised for mechanically solving the astronomical triangle. It is made to represent the celestial sphere. For instance when the latitude, declination and hour angle are set upon their proper graduated arcs, the corresponding altitude and azimuth me be read on their proper arcs and vice versa. Such instruments are costly and subject to instrumental errors, but they are very useful for checking computations and may some day be devised in a form useful to the navigator."

    Is anyone familiar with this device?

    Regards,

    Johannis Geelhoed

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