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 256
raphical purposes. THEORY OF STADIA MEASUREMENTS. 200. Fundamental Relations.—In Fig. 61 let LS be anylens, or combination of lenses, used for the object-glass of atelescope. TOPOGRAPHICAL SUP VE YING. 225 Let A^B^ be a portion of the object (in this case the stadia-rod), and let A^B^ be its image.… … Fig. 61. the instrument, or the intersection of the plumb-line, extended,with the axis of the telescope. Let E^ and E^ be the principal points, ^ and let thedistance FE^ = f (focal length), /■£, = A A^B^ = i (for image, intercepted portion),A^B^ = s (for stadia, intercepted portion).Then, since…
Surveying
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