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  • Strange Stopwatch

    This isn't a slide rule, but I figure this group is my best bet. Some years ago my grandfather died. He had been a mechanic, and I found this stopwatch among

    10 hours ago
  • Re: The Et Ultra Washington patent

    Hello Andre, H-39 (Ferrero-Washinghton) or model G (aka Et Ultra) ? For the first i have some photos taken from the book: Giovanni Pastore ANTIKYTHERA E I

    a_celli 1 day ago
  • Slide rule beginnings in China

    I have heard that in China there might be slide rules before Napier, Gunter or Oughtred. I think somebody in a presentation long ago showed some old Chinese

    e_lento13 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

  • 1622
  • Mathematics
  • Dec 21, 1998
  • English

Group Settings

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