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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 36

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 36
increasing graduations of the main scale.Thus, for e.xaniple, in Fig. 28, it will be noted that the zero </, PLANE SUliVEYlNG 25 has passed the 150th space on the main scale, and is near the 30niinnte (half degree) division li, therefore the coincidino- lines ofthe vernier and main scale must be… … Fig. 2,3. Fig. 24 represents another method of division of tlie circle ofthe transit. The vernier is douljie, and ti)e figures on tlie vernierare inclined in the same direction as the figures on the scaie towhich they beloncr.

Surveying

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