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Dutch Circle of Slide Rule Collectors

Summary                            

Founded in 1991, The Dutch Circle has grown into an informal group of about 60 collectors, 
sharing the following goals:

  1. mutual support of members for collecting and research
  2. promotion of public knowledge and awareness of the historical interest of the slide rule

These goals are pursued by issuing our periodical "MIR", by organising meetings,
presence at fairs, by publishing papers, books, catalogues, interviews and by
communicating with Dutch and international  communities of collectors and
other interested parties.

End 2004 the area of interest has been expanded, and the name of the Circle was changed to
Kring Historische Rekeninstrumenten (Dutch Circle for Historical Calculating Instruments)

 

Breaking news...

The 27th International Meeting of Collectors and Researchers of Slide Rules and other Historic Computing Instruments will be held as a teleconference via the Internet on September 11 & 12, 2021. This year's theme will be
Computing Instruments Collecting in Pandemic Times
For more information: please visit www.im2021.org


Announcing a new Book for Slide Rule Collectors:

“THE ALRO CATALOGUE” …

… featuring for the first time all 52 currently known solid calculating discs and slide rules, plus the over a hundred slide charts, that were produced by the Dutch firm “ALRO” in the city of The Hague, from the mid-1930’s until the late 1990’s.

We proudly announce “THE ALRO CATALOGUE” (2020), in a hardback bound book format, with more than 200 pages of descriptions, tabular data, documentary annexes, a new coding system for identification, and most importantly the high-resolution colour images of each and every ALRO that is known today.

“THE ALRO CATALOGUE” is for sale at € 35.- + shipping costs

For more information - and ordering - click here


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