Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 60
laid off from A, thepoint Df at which the perpendicular CD meets AB, becomesknown. If the length of the perpendicular is desired, it may befound from the proportion, AE: EF :: AC: CD, in which all the terms are known except CD. It is always best to make AF nearly equal to AD when practicable ; for… … Fig. 37. 78. To trace on the ground a straight line that shall passthrough a given point and be parallel to a given straight line. Let ABhe the givenline and P the givenpoint. From F meas-ure any oblique line toAB, as PQf and markits middle point, whichcall m in the figure. From any point of AB, as…
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