A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 100
rresponds to a division on thescale, 1 on the vernier will be ^ of an inch below the nexton the scale, 2 will be ^ below; and so on. If the vernieris raised so that the 1 on the vernier is in line, it is raisedi^o inch; if 2 is in line, it is raised ^; and so on. Thereading in Fig. 58 is 29.7… … 98 PLANE TRIGONOMETRY. [Chap. III. Thirty spaces on the vernier are equal to twenty nine onthe arc. The reading is therefore to -^ of 30 minutes = 1minute. The zero of the vernier stands between 41° 30and 42°. On looking along the vernier, it is seen that thefifth and sixth lines coincide about…
Surveying
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