Hinks, Arthur R. (Arthur Robert), 1873-1945 · Cambridge : University press · leaf 140
strument is turned about the vertical axis. But the effect of thesecond error is that the telescope is pointing up or down at some smallangle to the horizontal when the axis of rotation is made truly vertical. Theresulting error of reading on the staff will be strictly proportional to thedistance… … Fig- 13- Suppose, then, that we wish to run a line of levels from A to B. Wemark out suitable stations K,L,M,... in the line AB, for the staves. Weset up the level midway between A and K, and find the difference of heightof the ground at A and K. Then we set up midway between K and Z, andso on.…
Maps · Surveying
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