A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 388
rc is usuallygraduated to 10, and read by a vernier to 10. 806. The box or pocket sextant has the same glasses as the largersextant, inclosed in a circular box about three inches in diameter.The lower part, which answers for a handle when in use, screws offand is used for a cover. The octant has an… … tant. In it the graduated arc extends to the whole circumference,and more than one vernier may be used by producing the index armto meet the circumference in one or two more points. 378 MAEITLMI-: OR BYDROGRAPHIG SURVEYING. 808. Adjustments of the Sextant. 1. To make the index glass2)erpcndicHhtr…
Surveying
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