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Numeric Demonstrator

circa 1900

'Perfect Times' learning aid

2001

Adolf Sonnenschein's 'Arithmometer', late 19th century.

late 19th century

Smith and Dolier's 'arithmetical scales', late 19th century.

1880-1900
Three sets of prototype cards for the 13, 14 and 17 times tables

Three sets of prototype cards for the 13

2001