Image credits

Photographs of the collection come from the exhibition catalogue “Multiply! Instruments and machines that multiply” (Claude & Marie-Paule Cargou, IREM – Brest 2012) and from the collection’s own archive.

The following illustrations show identical models or people from other collections:

• Adix — crisvandevel.de
• Alpina advertisement — Arithmeum, Bonn
• Alpina — Arithmeum, Bonn
• Amsler planimeter — Wikimedia Commons (CC0)
• Archimedes Modell C16 — Technische Sammlungen Dresden, via Wikimedia Commons (CC BY-SA 4.0)
• Arthur Burkhardt (Lehmann 1989) — computer-timeline.com
• British Calculator Model C — Ridai Museum of Modern Science, Tokyo, via Wikimedia Commons (CC0)
• Christel Hamann — Heinz Nixdorf MuseumsForum blog
• Coat of arms of the canton of St. Gallen — Wikimedia Commons (public domain)
• Compteur Lafond — computer-timeline.com
• Comptometer Model A — Wikimedia Commons (public domain)
• Dactyle No. 8816
• Edwin Thacher — Wikimedia Commons (public domain)
• Et Ultra Washington — ANCMECA forum
• Fuller calculator by Stanley — Science Museum Group
• Ichida Answer Game Machine — vintagespacetoys.com
• Keuffel & Esser logo — mccoys-kecatalogs.com
• Locke Adder — retrocalculators.com
• Loga-Calculator, Daemen-Schmid — Wikimedia Commons
• Multical — jaapsch.net
• Natale Capellaro — museotecnologicamente.it
• Original Odhner advertisement
• Otis King calculator leaflet
• Rokli calculator
• Rokli maker’s plate, Robert Kling Wetzlar
• Tate's Arithmometer — Ridai Museum of Modern Science, Tokyo, via Wikimedia Commons (CC0)
• Thomas de Colmar — Wikimedia Commons (public domain)
• Webb Adder — National Museum of American History, Smithsonian Institution