A Course in the Elements of Surveying

Cover A Course in the Elements of Surveying
A Course in the Elements of Surveying
Charles C Swafford
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One form cf vernier is constructed by taking 29 degrees UNIVERSITY OF CALIFORNIA EXTENSION DIVISION CORRESPONDENCE COURSES IN ENGINEERING SUBJECTS PLANE SURVEYING COURSE X-lA METHODS OF GRADUATING SURVEYING INSTRUMENTS AND POPULAR STYLES OP VERNIERS FURNISHED FIG. 24 Single vernier reading to 20". Circle graduated to 20' with two rows of figures.
10 20 '"I ^rt^'W rH^^r ao ilo FIG. 25 Vernier reading to 2'. Circle graduated to single degree.
3ft A FIG. 26 Double vernier reading to single minutes
.... Circle graduated to 30'.
Elera. Of Surv. 1L . Ussigmaent 9 Page 7 (when the smallest division on the limb is the whole degree) and subdividing it into 30 equal parts for the vernier scale. The value then of one division on the vernier will differ by 1/30 of 1 degree, or 2', from a single division on the limb; this value ie called the "least count " of the vernier. Another commonly used vernier is formed by subdividing 2S half-degrees (the smallest rivision on the limb being a 30* space) into 30 equal parts on the vernier scale; here we have ** = I 1 as the least count.


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