![img_21-3.jpg](https://gazette-eu-west2.azureedge.net/media/31784/img_21-3.jpg?width=750&height=500&mode=max&updated=08%2f06%2f2018+09%3a23%3a05)
The inaugural sale in the new, purpose-built gallery in the Aeolian Hall, Bloomfield Place, it “…ranges from medieval and Renaissance works on arithmetic, finger-reckoning and the abacus, to the birth in the 20th century of theoretical and practical computer science under Alan Turing”, according to Sotheby’s.
Illustrated above is a page from Pietro Borgo’s Aritmetica mercantile, printed in Venice in 1484 by Erhard Ratdolt, estimated at £40,000-50,000.