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
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. … Fig. 24. It will lie noticed that the main scale reads directly to 20minutes and that the vernier is so divided that 39 spaces upon thescale correspond to 40 spaces upon the vernier. The least countof the vernier is therefore ^ of 20 minutes or fif of 1 minuteequals 30 seconds. To read the inside…
Surveying
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