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 111
rade wouldbe trtfe cut or fill at each point, which could be at once takenout and marked on the line stake. THE HAND-LEVEL. 80. Lockes Hand-level is a very convenient little instru-ment for rough work, such as is done on reconnaissance expedi-tions. It consists of a telescope with a bubble attached… … Fig. 16. EXERCISES WITH THE LEVEL. 81. Adjust the bubble to the line of sight by the first, or indirect, method,and then test it by the second, or direct, method. If this second method doesnot show it to be in adjustment, where does the error lie ? 82. Cause the line of sight and bubble-axis to…
Surveying
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