A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 103
r reads to minutes. When thezero of the vernier is to the left of that on the limb, thefigures begin at the zero and increase towards the left to15; they then pass to the right-hand extremity, and againproceed to the left ; that is, they stop at A and commenceagain at B. The upper figures of each… … Fig. 65.E 182. If the preceding descriptions have been thoroughlyunderstood, the student will have no difficulty in readingthe arc on any limb, however it may be divided. He shouldstudy the different positions until he can determine theangle with readiness, however the index may be placed.For this…
Surveying
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