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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 66

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 66
ular hand level in many respects, except itis provided with screw centering and focusing adjustment andcan be adjusted to the different widths of the eye, avoiding allstrain to tlie ocular muscles. PLANE SURVEYING 53 Adjustment. Follow the ])riiKiples as laid ilown coiiferningthe Locke hand level.… … Adjustment. Follow the principles as laid down relative tothe Locke hand level. Setting up the Instrument. The term setting up thelevel means to place it inposition to secure horizontal sights. Todo this, plant the legs firmly in the ground at approximately 54 PLANE SURVEYING equal distances apart…

Surveying

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