The builder's dictionary, or, Gentleman and architect's companion : explaining not only the terms of art in all the several parts of architecture, but also containing the theory and practice of the various branches thereof ... : also necessary problems in arithmetic, geometry, mechanics, perspective, hydraulics, and other mathematical sciences : together with the quantities proportions, and prices of all kinds of materials used in building ... (1734)

Toms, W. H. (William Henry), ca. 1700-ca. 1750, Devoto, John, fl. 1719-1752 · London : Printed for A. Bettesworth and C. Hitch ..., and S. Austen ... · leaf 409

An illustration from The builder's dictionary, or, Gentleman and architect's companion : explaining not only the terms of art in all the several parts of architecture, but also containing the theory and practice of the various branches thereof ... : also necessary problems in arithmetic, geometry, mechanics, perspective, hydraulics, and other mathematical sciences : together with the quantities proportions, and prices of all kinds of materials used in building ..., 1734, leaf 409 — ditferent Denominators, re-duce them into the fime ; thenadd the Numerators together, andunder the Sum write the com-mon Denominator, thus, e. g.f-f f =if-f.|^=i x^^.andf Secondly^ If compound FraCtiom are given to be added, theymud firfl be reduced to fimplcones: and if the Fratiions beof… … F R added, then the Fraftioiia! Parts;and if their Sum be a properFradion, only annex it to theSum of the Integers. If it be an improper Fradiiotf,reduce it to a mixd Number,adding the Integral Part thereofto the Sum of the Integers, andthe Fraiitoml Part after it, as III. SHkra(^io}tofFra6i\ons.…

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