Robertson's 'Rapid Calculator', c 1910.

Made:
1910-1920 in Glasgow
Robertson's rapid calculator, pat no

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Robertson's rapid calculator, pat no
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Robertson's rapid calculator, pat no.5871,1910, a form of "ready reckoner" made by the Robertson Rapid Calculating Machine Co. Ltd. 140 Bath Street, Glasgow, (glass cracked in one cursor, and nearly all internal paper tables of figures torn)

Robertson's Rapid calculator, pat no. 5871,1910. Made by the Robertson Rapid Calculator Company of Glasgow, this was one of several large-scale ready reckoners to be developed in the first decade of the 20th century. This form of ready reckoner placed the tables of numbers on four rollers, each one of which was likened to 'a book with 200 or 300 pages open at the one time'. It gave the cost of various quantities of goods at various prices per pound, hundredweight or ton.

Details

Category:
Mathematics
Object Number:
1929-978
Materials:
metal (unknown), ebony, brass (copper, zinc alloy), paper (fibre product) and glass
Measurements:
Overall: 300 mm x 840 mm x 250 mm, 21 kg
type:
ready reckoner
credit:
H.M. Stationery Office