Loading ...
Sorry, an error occurred while loading the content.
  • Back
  • About Group

  • Join Group
, added in the last 7 days
New MessagesSee All
  • Re: Neutral circle as applied to planimeters?

    It's the pole, so the end with the weight, that doesn't move, to that's important. So if the fixed end is inside the area to be measured, typically say for a

    g4ugm 1 day ago
  • Re: Neutral circle as applied to planimeters?

    I have 10 or so planimeters of different sizes and types. I found several manuals. I found a description of the "neutral circle" but I do not fully understand

    clarkmccoy2 1 day ago
  • Re: Neutral circle as applied to planimeters?

    Paul, Curiosity tempted me to buy a planimeter some time ago. Maths books up to the 1960s describe the theory, which to me is complex (integral calculus). The

    dieswartdose 1 day ago
Fetching Sponsored Content...

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

  • 1635
  • Mathematics
  • Dec 21, 1998
  • English

Group Settings

  • This is a restricted group.
  • Attachments are not permitted.
  • Members cannot hide email address.
  • Listed in Yahoo Groups directory.
  • Membership requires approval.
  • Messages require approval.
  • All members can post messages.

Message History