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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 468

An illustration from 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, leaf 468 — Fig. 122. It is not easy always to fulfil these conditions satisfactorily.To make it visible against light or dark backgrounds, it is well … Fig. 123. to paint it in alternating black and white belts. For ready bi-section it should be as narrow as possible for distinctness. This 440 SURVEYING. is accomplished by making the width subtend an angle of fromtwo to four seconds of arc. Since the arc of one second isthree tenths of an inch for…

Surveying

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