Direct calculator (series 0) containing over 1,000,000 distinct calculations
Subtitle: for expediting and ensuring accuracy in multiplication, division, average, percentage, interest, exchange, and general calculation by all combinations of numbers from 1 to 1,000, (larger numbers being most quickly worked in groups of three figures). Arranged for instant and direct reference by marginal indices, etc
Edition: 2d ed.
Publisher: McCorquodale
Published: 1903
Place of publication: London
Language: eng