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 93
formed at the plane of the cross-wires, which are attached to thereticule held in place by the capstan-screws shown in the cut. The 62 SURVEYING. … line of sight, or line of collimation, is the line Joining the twocorresponding points in object and image with which the ADJUSTMENT, USE, AND CARE OF INSTRUMENTS. 6^, intersection of the cross-wires coincides.^ Evidently thisline of sight may lie anywhere in the field of view within thelimits of…
Surveying
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