Engineers' Surveying Instruments, Their Construction, Adjustment, And Use
Engineers' Surveying Instruments, Their Construction, Adjustment, And Use
Ira Osborn Baker
The book Engineers' Surveying Instruments, Their Construction, Adjustment, And Use was written by author Ira Osborn Baker Here you can read free online of Engineers' Surveying Instruments, Their Construction, Adjustment, And Use book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Engineers' Surveying Instruments, Their Construction, Adjustment, And Use a good or bad book?
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It is con- venient, though not necessary nor quite as accurate, to set the vernier to read zero at the beginning, instead of reading it where it may chance to be. 130. Angles Measured More Accurately. It sometimes happens that an engineer desires an angle with the utmost accuracy. There are two methods of making the observations when extreme accuracy is desired; viz., ly series and fy repetition. One or the other of these methods is always used in measuring the principal an- gles of a geodetic ...triangulation. The principles in- volved are useful in less accurate work. 181. By Series. Sight upon the first station, and read both verniers to eliminate eccentricity. Sight upon Digitized by^OOQlC Il8 THE TRANSIT. [CHAP. VII the next station to the right, and read as before. Con- tinue around the horizon, reading upon each station, and close by reading upon the first station again. If the last reading is the same as the first, it proves that the instrument did not slip or get moved. Reverse in altitude and azimuth, turn on the lower axis a little to eliminate personal bias, and read upon the first station.
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