Abstract
IN NATURE, vol. xviii. p. 327, we noticed “Automatic Arithmetic” by the same author. We need only endorse the remarks we previously made with regard to the former work, and commend the present admirably compact and handy calculators to practical men who, after a little time spent in getting over the manual difficulty to beginners in manipulating the vertical and horizontal slips, will find these works very serviceable as ready reckoners. Multiplication is reduced to a mere addition of digits: the earlier work facilitated the operation of division as well. We may add that the “Multiplier” is issued in three forms, i.e., for multiplying 4 figures by 4 figures, 6 figures by 4 figures, and, as in the specimen we have, 8 figures by 6 figures.
The Automatic Multiplier: for Performing Multiplication without Calculation and without Writing down any Figures except the Answer.
By John Sawyer (London: George Bell, 1880.)
The Automatic Calculator, for cwts. qrs. lbs. at per lb., Supplying the Cost of any Weight at any Price up to 11s. 11 7/8d. per lb.
By the same.
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The Automatic Multiplier: for Performing Multiplication without Calculation and without Writing down any Figures except the Answer The Automatic Calculator, for cwts qrs lbs at per lb, Supplying the Cost of any Weight at any Price up to 11s 11 7/8d per lb . Nature 22, 316 (1880). https://doi.org/10.1038/022316b0
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DOI: https://doi.org/10.1038/022316b0