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    Re: The Appleyard Course and Distance Computer
    From: Adrian F
    Date: 2019 Mar 11, 10:51 -0700

    David,

    The questions around the Appleyard computer are interesting.  I’ve found these references if any use to you :

     

    A description of the use of the “arms” of the computer in a 1922 report (page 22-23) :  

    https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930091194.pdf

     

    A brief article in “Flight” magazine of 14 January 1937 described a further use for the arms, and indicated how the “Appleyard scale” could be used to roughly convert indicated air speed to true air speed. I couldn’t glean from that any reason for the discontinuous scale.   The article is in the Flight magazine archive hosted by Flightglobal:

    https://www.flightglobal.com/pdfarchive/view/1937/1937%20-%200100.html

     

    I see that the Imperial War Museum in the UK holds a 4-page document from 1918, “Description and use of the Air Speed Computer designed by Commander Rollo Appleyard R.N.V.R.”, its  listing is at : 

    https://www.iwm.org.uk/collections/item/object/1504002019

    Adrian

       
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