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    Re: slide rule
    From: Paul Hirose
    Date: 2010 Apr 27, 11:43 -0700

    Hewitt Schlereth wrote:
    > Shufeldt's skide rule is a Keuffel & Esser Log Log Duplex Trig. Log
    > Log means it has logarithm scales. Duplex means it has scales on both
    > sides. Trig means the trig scales are in degrees and minutes.
    His rule is one of the K&E 4080 family, a good choice for someone
    wanting to get into slide rules nowadays, since it's got a full
    assortment of scales for science and engineering, yet is plentiful and
    affordable on eBay. I wrote about it at some length last year:
    Keuffel & Esser completely changed their numbering system in the early
    1960s. A 68 1256 is equivalent to the earlier 4181-3.
    The years of the deteriorating plastic in the top and bottom cursor bars
    are not precisely defined; I've read that K&E changed to an improved
    plastic as late as the late 1940s. As far as I know, the rules with
    all-plastic bodies used the later material and had no problem. One of my
    4181-3s was awarded as a prize by the Texas Chemical Council in 1963,
    and looks brand new. (Apparently the recipient already had his favorite
    slide rule, and never used the prize.)
    I believe all Pickett rules use decimal trig graduations, so would not
    be suitable for the original poster.
    On the other hand, most simple slide rules with the classic 9-scale
    arrangement seem to have used degrees and minutes. This would include
    the K&E 4053, Post 1452, and Sterling Precision.
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