The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 42
out up to 900. 17. Other Instruments for measuring distances with greataccuracy will be discussed under the head of Base-LineMeasurements, Chapter XIV. ADJUSTMENT, USE, AND CARE OF INSTRUMENTS. 13 CHAPTER II.INSTRUMENTS FOR DETERMINING DIRECTIONS. THE COMPASS. 18. The Surveyors Compass consists… … Fig. 4. 4 shows a very good form of such an instrument. In ad-dition to the above essential features, the instrument hereshown has a tangent-screw and vernier-scale at e for settingoff the declination of the needle; a tangent-scale on the edgeof the vertical sight for reading vertical angles, the…
Surveying
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