International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 37
w, as the circle graduations 026 SURVEYING. read from left to right, we read the right-hand vernierand find that the 2M graduation on the vernier coincideswith a graduation on the divided circle, and the vernierreads 23, which we add to 74°, making a reading of 74° 23,an angle to the /i//. In Fig.… … 13th graduation on the vernier coincides with a graduationon the circle, and the vernier reads 13. Accordingly, weadd to 07^°, the vernier reading of 13, making a total read-ing of 67° 43, an angle to the rigJit. ADJUSTING THE TRANSIT. 1232. The constant use of an instrument tends to dis-arrange…
Railroad engineering
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