Time tables, on a new construction, whereby four hundred calculations may be made in one hour

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Page 96 - Required the 1nterest of 80 for 90 days, at 2| per cent. per annum. Find in the left hand column 80, opposite to which in the column under the title 2^ per Cent. you have 40. Then turn to the table for 90 days' interest on 40, and you will find 9s.
Page 117 - P. 31 Days. 32 Days. 33 Days. 34 Days. 35 Days. . . sd . sd ~~.~.

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