a slide rule
of the circle
Groups and Activities
More than 1000 slide rule collectors are known
Looking at the number of buyers on internet (at eBay and dealers),
there must be many thousands of other interested people. Some of them are organised in country- or
language-focused groups, but others are more "lone hunters".At the moment, 5 groups of slide rule collectors
are known, with the observation that some individuals belong to more than one
Oughtred Society (OS), a formal
"non-profit public benefit" organisation in the USA, is since 1991
the largest group of slide rule collectors. More than 400 OS-members exist
world-wide, of which about 100 in Europe. Since 2003 the Oughtred Society has
extended its interest to "Historic Calculating Tools".
For the brochure of the Oughtred Society click on:
"Journal of the Oughtred Society" (JOS) is the publication which is
known as a professional and prestigious paper. The JOS is published twice a
year (the Spring and Fall issue).For more information about the JOS, Click
Since 2009 the Journal is in full color.
More activities have been started from 2005
the Oughtred Society Award
- the Oughtred
- new Oughtred
The OS membership fee -outside the USA-
is $ 45.-,
translated to European currency
at 35.- EURO.
The membership fees can be paid by creditcard (PayPal, see the OS
website), or via one of the contact persons.
In the Netherlands the contact is Otto
The "Nederlandse Kring van Verzamelaars van
Rekenlinialen" (NKVR), or "Dutch Circle of Slide Rule
Collectors" is an informal group of some 60 Dutch and
Dutch-language members, established in 1991.
End 2004 the scope of the Dutch Circle has been formally extended, and its
name changed to "Dutch Circle for
Historical Calculating Instruments".
The magazine for Circle members is called "MIR".
Kingdom Slide Rul Circle (UKSRC) is an informal group of about 100
English and English-language members, established in 1996. The magazine for
members is called "Skid Stick".
Each year an issue of the UKSRC "Slide Rule
Gazette" is published with some 100 pages of more extensive articles
Treffen (RST) or "Slide Rule Collectors Meet" is an informal
group of more than 80 German and German-language members, established in
1997. The magazine for members is called "RS-Brief",
and the full contents can be found on-line at the RST
Slide Rule Group (ISRG) is an Internet discussion group at Yahoo,
with a membership of about 1000. See also publications.
Since 1995, an "International Meeting for
Slide Rule Collectors" (IM) has been organised every year in Europe.
Each IM is organised by collectors from one country.
The programme consists as a rule of a swap fair, presentations by and to
collectors, and ample opportunity for social events and talking with old and
new collector friends.
Proceedings have been published during each IM, documenting all presentations
For most IM Proceedings, it is possible to order
back-copies, for prices around 20 EURO, excluding
shipping costs. ask
for more information.
The following IM's have been held until now:
IM2019 will be held in
The Hague and Scheveningen
from September 20th to September 22nd 2019.
See the Information sheet
and Registration Form.