Popplewell, William Charles, 1865- · London, New York [etc.] Longmans, Green and co. · leaf 109
FIG. 82. FIG. 83. This vertical circle is read by means of one vernier only, and thehorizontal circle has two verniers. The main difference between the plain theodolite and the transittheodolite is that in the former the telescope cannot be transited orturned completely round, and that the…
Surveying · Geodesy
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