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 101
tenth is in effect divided into ten equal portions, so thatthe unit is divided into hundredths. SEMICIRCULAR PROTRACTOR. This instrument is used to measure given angles, also to de-termine how to draw lines which shall form with each other any 90 SURVEYING. [CHAP. VII. desired angle. This… … The above comprise the most essential instruments used inplotting fields; there are, however, a great many other instru-ments which have been devised which at times are very conve-nient. Their use will be readily understood when seen. § 66. INSTRUMENTS FOR MEASURING ANGLES. THE SURVEYOR S COMPASS.…
Plane trigonometry · Surveying
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