In the early 90's, a steadily growing group of
interested visitors gathered yearly around the impressive stand of slide rule
collector IJzebrand Schuitema at the Utrecht Collectors Fair.
That was the start of what we now call the "Circle",
a group of friends who share one passion: the collecting of slide rules.
Not only the search for ancient and special specimens is our goal, but also
the acquiring and sharing of information and documentation about this
unique branch of industrial archeology.
as a hobby
For slide rules there exists a
clearly demarcated era of production, from about 1625 to 1975. Let us not
assume that a collector can ever call his collection complete. Hundreds of
makers and manufacturers are known, together accounting for tens of thousands
of models and types. Some well-known brands are Aristo, Faber-Castell and
Nestler from Germany, Blundell-Harling from England, and Pickett and Keuffel
& Esser from the USA.
Every collector will feel the need, at some time, to specialise in a
particular brand, a special application area, or a distinctive type of
Slide rule collectors often have adjoined areas of interest, like addiators or
other mechanical calculators, drawing instruments like planimeters or
compasses, or even stamps with the slide rule theme. The members of the Dutch
Circle therefore represent a large diversity of interests.
As happens in any group of collectors, the social contacts between members
turn out to be at least as important as the object of collecting itself.
of the Scope of the Dutch Circle
During the yearly meeting of December 2004, the decision was taken
to expand the focus of the Circle formally, changing the name into:
or in English:
"Dutch Circle for Historical Calculating Instruments"
This has been implemented
The website stays for the time being at www.rekenlinialen.org,
and will be renamed later. Also the logo will be adapted.
The following text
describes the new definition of the Dutch Circle:
Dutch Circle for Historical Calculating
consisting of connoisseurs, collectors and researchers of
historical calculating instruments
like slide rules, mechanical and electronic calculating machines, sectors,
calculating tables, abaci, planimeters, compasses and other drawing instruments,
plotting and measuring
and other calculating devices.
The focus of interest is on history, design, construction,
production, collecting and
but also applications, numerical techniques, and usage of the many types of
which were the tools of scientists, technical professionals and
other users in
The mission of the Kring is:
|Mutual support of kring members in their pursuits,|
|Promotion of public knowledge and awareness of the
historical interest of |
The Kring communicates primarily in the Dutch language.
The Kring evolved end 2004 from the Dutch Circle of Slide
(Nederlandse kring van Verzamelaars van Rekenlinialen),
and has also welcomed some members of the former (Dutch)
Historical Office Equipment Mercurius.
Top of page