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  • Re: Cosine of a very small angle.

    Hello Steve and everyone.  I would also like to see that solution. Here is How I would solve this problem without ST scale.  cos(86°) * tan(87°)

    fabrice94 13 hours ago
  • Pickworth Reprint

    Amazon.com lists a paperback reprint of the iconic Pickworth manual at $6.99. If you are an Amazon Prime member, postage is free. E Dean Butler

    edeanbutler 13 hours ago
  • New file uploaded to sliderule

    Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the sliderule group. File : /Manuals/How

    sliderule@yahoogroups.com 1 day ago
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Group Description

The International Slide Rule Group "ISRG" is devoted to collectors of slide rules and associated mechanical calculating instruments.

You may contact the listowner at:


To subscribe, send an email to:


If you are serious about slide rule collecting, it is highly recommended that you consider joining

The Oughtred Society.

Brought to you by:

Cyril Catt  - 
Andrew Davie  - 
Gary Flom  - 
Craig Kielhofer  - 
Jerome Mc Kenna

Slide rules are THE ORIGINAL solar powered calculators. Try using one in the dark and you'll see I'm right, or not see as the case may be.

This is your groupowners attempt at humor.

Group Information

  • 1636
  • Mathematics
  • Dec 21, 1998
  • English

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