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Messrs. Scheutzs New Calculating MachineMessrs. Pehr (Per) Georg Scheutz (1785-1873) and Edvard Scheutzs (of Stockholm, Sweden) New Calculating (Tabulating) Machine
Circumference of the Earth. Leonardo da Vinci (1452-1519) deCircumference of the Earth. Eratosthenes (250 BC) calculated the circumference of the Earth by measuring noontime shadows at two localities of different latitude
Childs slate and toy gun on a Christmas card. early 20th century
French bank note, 50 FrancsFrench bank note, Banque de France, 50 Francs, issued on 19 May 1949. With a portrait of the French mathematician and astronomer Urbain Jean Joseph Le Verrier (1811-1877) on the front
Childs slate with pen and toy soldiers on a New Year card. Date: early 20th century
Childs slate with pen and scribbles on a New Year card. Date: early 20th century
Childs slate with pen and scribbles on a Christmas card. Date: early 20th century
Childs slate with pen and baubles on a Christmas card. early 20th century
Abacus, also called a counting frame. Cesis. Latvia
Princess Trixie the Highly Educated HorsePrincess Trixie, a Grey 1/2 Arab mare, who was highly educated and travelled the world - here she is advertising (" Grand" ) National Cash Registers, by keeping her accounts in check
Calculating calendar - dates and daysA remarkable calculating calendar of Yogi Fazalelahi Shiekh. You follow the instructions and (remarkably) it works superbly and will tell you the day of the week for any day that has ever been