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    Re: Speaking of slide rules
    From: Paul Hirose
    Date: 2013 Mar 31, 15:58 -0700

    Alan S wrote:
    > It's a K & E 4081-3, which appears to be in proper condition. The rule 
    itself is a bit dirty, I suspect that it will clean up.
    The Bygrave accuracy test I described in 2009 was worked on a sibling of
    your rule, a late 1950s K&E 4181-3.
    Mine is just like yours, except made of plastic. Well, maybe not "just
    like". K&E went through several scale sets over the years. And they did
    get the plastic problem fixed - in the 1940s? Mine has no trace of
    It did have gunk - probably dried grease - in the grooves. Why anyone
    would grease a plastic rule is beyond me. Fortunately, plastic cleans up
    easily. Remove cursor, disassemble body, use dishwashing detergent and a
    toothbrush in the sink!
    I own only a couple wood rules, and fortunately neither needed cleaning.
    There's all kinds of advice on the Web on slide rule cleaning. This site
    specializes in K&E:
    I filter out messages with attachments or HTML.

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