A system of geometry and trigonometry : with a treatise on surveying (1830)
Flint, Abel, 1765-1825, Gillet, George, Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Hartford : Cooke & Co. · leaf 22
C, to drop a perpendicular on a ,given line AB. Fig 25. ^_ I» -- X-B With one foot of the dividers in C describe an arc to cuthe given line in two places, as at F and G ; upon F and Gdescribe two arcs to intersect each other below the line as atD ; lay a rule from C to D and draw a line from C to… … Open the dividers to any convenient distance, and with onefoot in B describe the arc FG ; with the same distance andone foot in E, describe an arc from H ; measure the arc FGand lay off the same distance on the arc from H to I; drawa line through I to E, and the angles will be equal. Fig. 27.…
Surveying · Geometry · Trigonometry
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