Morland's calculating machine

1666-1680

Webb's "Adder", patented 1889, with cover

1889-1900

GEM calculator, 1890.

1890-1900

Golden Gem stylus-operated adding machine

1904-1910

Troncet's 'Totalisateur', with pencil stylus and case

circa 1895

Addiator, stylus-operated calculator for adding and subtracting sterling currency

1955-1965

"Quantotar Addiator" calculator for addition and substraction of British Weights

1924

"Addiator" calculator with stylus and pencil

1924

Addometer adding machine with eight stylus-operated dials, c 1925.

1900-1920

Brical British calculator

1900-1909

"Comptator" in case: complete with stylus

1920s

Stima adding machine with automatic tens carry

circa 1930

Adding machine, fitted box, stylus and instructions

circa 1910

Exactus stylus-operated adding and subtracting device

1930-1950

'Addiator' calculating machine, c 1924.

1924

Kingson Pocket Calculator with stylus

Troncet's arithmograph

Addimult, Sumax-E stylus operated adding and subtracting device with case.

1955-1965