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2 members, 15 messages added in the last 7 days
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  • Re: Can someone identify William Hewlett's slide rule?

    I think that it's certainly a K&E. It might be a 4081-3, but it could be an earlier rule such as a 4091-3 or 4092-3. Depends on when he bought it. Since he

    mngwright 7 hours ago
  • Re: Fowler Calculator

    Be careful if you remove the screws in the back, it is fiddly to put back together. Sent from my iPhone

    8 hours ago
  • Re: World Championship Slide Rule Competition

    The tolerance was +/- 2 on the third digit. I’m thinking the Slide Rule test was 45 minutes. But it’s been over 40 years, so I may not have it quite

    s.dirickson@att.net 12 hours 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

  • 1559
  • Mathematics
  • Dec 21, 1998
  • English

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