A Manual of Field And Office Methods for the Use of Students in Surveying
A Manual of Field And Office Methods for the Use of Students in Surveying
William David Pence
The book A Manual of Field And Office Methods for the Use of Students in Surveying was written by author William David Pence Here you can read free online of A Manual of Field And Office Methods for the Use of Students in Surveying book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Manual of Field And Office Methods for the Use of Students in Surveying a good or bad book?
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Leave the screws snug. Altitude Screws. — To make the bubble line and the bottom ele- ment of the rings parallel.— Msike the element level with the foot screws and bring the bubble to the middle by means of the altitude adjusting screws. The element is made level by the method of reversions as follows: With the level clamped over a pair of foot screws, as above, lift the clips and level up precisely; cautiously lift the tele- scope out of the wyes, turn it end for end, and very gently replace I...t in the wyes; if the bubble moves, bring it half way back by means of the foot screws. Before disturbing adjusting screws make several reversals, and conclude the adjustment with screws snug. This end for end reversal is similar to that made with the carpenter's level, the straight edge of the level corresponding to the element of the rings. The lines Involved are shown in Pig. 16. Iiine of CoUimation. — To make the line of coUimatlon coincide uAth the oMs of the rings. — ^Loosen clips, sight on a point, say a nail head or the level target, more distant than the longest slg
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