Spons' Dictionary of Engineering, Civil, Mechanical, Military, and Naval, Vol. 1: With Technical Terms in French, German, Italian, and Spanish (Classic Reprint) - Hardcover

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Excerpt from Spons' Dictionary of Engineering, Civil, Mechanical, Military, and Naval, Vol. 1: With Technical Terms in French, German, Italian, and Spanish

The calculator, No. 3, is an instrument designed to facilitate the addition of partial products in cases when the multiplier is composed of several numbers; it consists of a box containing small slate rules movable in horizon grooves; the partial products are written down upon these small slates, and since these are made to slide, it is easy to place the products in the order they respectively must occupy.

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