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    Air Navigation, Local Hour Angle Type X-1 computer
    From: Ed Popko
    Date: 2016 Feb 17, 09:15 -0800

    On a whim, I bought a "COMPUTER, AIR NAVIGATION, LOCAL HOUR ANGLE TYPE X-1" plastic circular sliderule.  A simple device which I assume is used to identify bright nav star azimuth for setting up shots. Similar to what HO 249 provides. But there wasnt any flier or example. The printed steps on the back are terse and obtuse, there must have been some additional instruction on how to set the various wheels.

    Essentially you set the device for the local hour angle of Aires and GCT.  The inner wheel is marked with 23 nav stars and their dec which I assume will align with one of the azimuth scales somehow.

    There is an additional window that indicates the correction of Polaris' true azimuth.

    Can anyone point me to some references, perhaps a previous air navigation manual that might have has a short writeup on it?



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