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    Re: Ruminatons on Bygrave and Hohenrechenschieber scale markings
    From: Brad Morris
    Date: 2013 Feb 24, 14:13 -0500

    Hi Robin

    Thanks for digging on this.  Does the Aristo name in the web address indicate post war manufacture?  I seem to recall Aristo name was used post war.

    Imagine the difficulty of drawing this and then making the production scales to fit the mechanical tubes.  To make an enlargement or reduction by photograhpic means moving the image plane towards or away.  The scale has to fit the tube and align along the seam to near perfection.  They didn't have the luxury of PostScript software manipulations! 

    Regards
    Brad

    On Feb 24, 2013 12:52 PM, "Robin Stuart" <robinstuart@earthlink.net> wrote:

    Also http://sliderulemuseum.com/Aristo/DennertAndPape_HR1_TomDilatush.jpg shows a G mark on an HR1 just visible at the corner of the window.
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