Plane trigonometry, and its application to mensuration and land surveying. Accompanied with all the necessary logarithmic and trigonometric tables (1852)
Perkins, George R. (George Roberts), 1812-1876 · New York, D. Appleton · leaf 155
henrun the line according to the given bearing, and measure thenearest distance between the line so run and the second corner;then divide this nearest distance by the length of the given line,and the quotient will be the sine of the difference sought. PROBLEM VII. To find the height of a… … ink, etc. If soft treacle be placed in a saucer, it will form avery good artificial horizon. Place the artificial horizon atF, and the eye at D, so that thetop of the object may be seen byreflection in F. Measure theheight CD of the eye, and thedistances CF and FA; then,since the triangles FCD and…
Plane trigonometry · Surveying
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