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Surveying ; a manual of practical instruction in the art of plane surveying, including plotting, leveling, triangulation, line running, cross-sectioning, traversing, and other details of field work (1910)

American School of Correspondence, Phillips, Alfred Edward, 1863- [from old catalog] · Chicago, American school of correspondence · leaf 83

An illustration from Surveying ; a manual of practical instruction in the art of plane surveying, including plotting, leveling, triangulation, line running, cross-sectioning, traversing, and other details of field work, 1910, leaf 83
htlyconical, which has on its lower end a ball turned perfectly spherical,confined in a socket by a pressure so light that the ball can bemoved in any direction in leveling the instrument. The ball isplaced eitlier in the brass head of a Jacob staff, or, better, in thetop casting of a tripod. A… … PLANE SURVEYING 73 line of sight. The compass is, however, so inaccurate that it wonldseem to be an lumecessary refinement. Prismatic Compass. This is a form of compass nsed ingeneral where merely ordinary work is required. It is abotit3 inches in diameter with a floating metal dial (see Fig. 57),…

Surveying

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