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 166
Fig. 30.—Front View. Fig. 31.—Back View. made in the form of a watch, the front and back views beingshown in Figs. 30 and 31. * Mr. Chas. A. Ashburner, Geologist of the Penn. Geol. Survey, has usedthis method with good results. 138 SUI? VE YING. When the instrument is attached to the belt in an…
Surveying
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