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    Re: Calculator v. Slide Rule for Ex-Meridian Correction
    From: Stan K
    Date: 2016 Jan 3, 21:18 -0500
    And the HP41-C flew on the Space Shuttle in the 1980s.

    https://hpinspace.wordpress.com/2009/07/16/hp-41-series-and-the-space-shuttle-program/

    All this slide rule talk has made me look for my old units.  So far I have found the two best ones:

    Pickett MODEL N4-ES Vector-Type LOG LOG DUAL-BASE SPEED RULE  (COPYRIGHT 1959, PATENT APPLIED FOR)
    Pickett MODEL N1010-T TRIG (COPYRIGHT 1959, PATENT APPLIED FOR)

    I'm embarrassed to say that all I remember how to do with them is multiply and divide, but at least I still have the books (at least for the N4-ES).  

    And my HP41-Cv is still alive and well, along with the magnetic card reader and thermal printer.

    Stan





    -----Original Message-----
    From: Paul Dolkas <NoReply_Dolkas@fer3.com>
    To: slk1000 <slk1000---.com>
    Sent: Sun, Jan 3, 2016 7:47 pm
    Subject: [NavList] Re: Calculator v. Slide Rule for Ex-Meridian Correction

    Although I also have a soft spot in my head for slide rules (I carry a circular one around with me on my watch), I feel it’s my duty to point out that by the end of the Apollo project – the 1975 ASTP joint flight with the Russians - NASA was flying an HP 65 programmable calculator as a backup, and they ditched the slide rules.
     
    Sorry - Paul
       
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