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'Perfect Times' learning aid

'Perfect Times' learning aid

2001
Numeric Demonstrator

Numeric Demonstrator

circa 1900
Adolf Sonnenschein's 'Arithmometer', late 19th century.

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

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

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

1880-1900
Box 1 (A and B) from Arithmetical teaching aid, "A. Sonnenschein's Improved Arithmometer", made by George Philip and Son, London and Liverpool. On the top of the lid is the sentence 'No. 1. B. (100)' at the very top.

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

late 19th century
Box 2 from Arithmetical teaching aid, "A. Sonnenschein's Improved Arithmometer", made by George Philip and Son, London and Liverpool.

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

late 19th century
2 plastic wallets containing cards from 'Perfect Times', a set of numbered cards to aid multiplication and division

'Perfect Times' learning aid

2001
'Perfect Times' a set of numbered cards to aid multiplication and division

'Perfect Times' learning aid

2001
Three sets of prototype cards for the 13, 14 and 17 times tables

Three sets of prototype cards for the 13

2001