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.
The original ALRO calculating disc is famous for its patented assembly of fixed and moving circular parts, housed in a hinged collapsible box that was used for protection when closed; but also — when unfolded — it provided an optimal “hands-free” desk stand.
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” has been prepared and produced by Otto E. van Poelje, under the aegis of the Dutch Circle for Historical Calculating Instruments, with support by the IM2019 organizing team.
“THE ALRO CATALOGUE” is for sale at € 35.- (in euro’s).
Additional shipping costs are:
€ 4.- for shipping within the Netherlands (NL), or
€ 9.- for shipping abroad: outside the Netherlands (NL)
Note that the € 9.- tariff applies for shipping to any other country in the world.
Orders for the ALRO BOOK can be placed via PayPal by one of the two next buttons
Alternatively, orders can be placed by bank account transfer:
send e-mail to: ovpoelje@rekeninstrumenten.nl