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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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    Re: Crelle's tables
    From: Dave Walden
    Date: 2020 Sep 27, 05:31 -0700

    Almost anyone who studied engineering in the 60's would be familiar with 20 inch slide rules.  I have a couple.

    Multi-divi was an alternative to Crelles.

    The Willis navigating machine was quite a device:

    https://catalogs.marinersmuseum.org/media/Media/00002/NQ32-The%20Willis%20Navigating%20Machine-A%20Forgotten%20Inv00636640696068796211.pdf

    Willis was quite an interesting fellow.  He was a graduate of the University of Virginia which holds a collection of his work:

    Papers, additional of Edward Jones Willis 1919-41.

    Author:Edward J Willis
    Edition/Format:  Manuscript   Archival Material : EnglishView all editions and formats
    Summary:
    Consulting engineer and inventor. Letters concerning his professional work as chairman of the Virginia. Board of Mechanical Survey; consulting work, particularly on heating and generating plants, including the U. Va. heating plant, as the inventor of the Willis planimeter, the Willis navigating machine, and other items, and as author of various articles for engineering and naval publications, and a book, "Methods of modern navigation." Included are many letters of inquiry about products and many orders for equipment needed in his home and laboratory. Personal correspondence to his sons, Francis Thomas Willis and Edward Fauntleroy Willis is included. [10 v. 31 cm. letterpress copies] -- Scrapbook, entitled, "Edward J. Willis, 1895", containing clippings about Willis and articles by him [ca. [50] p. 24 cm.].  Read less
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