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 254
graphical 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 A2B2 be a portion of the object (in this case the stadia-rod), and let AXBX be its… … Fig. 61. the instrument, or the intersection of the plumb-line, extended,with the axis of the telescope. Let Ex and Z?a be the principal points, * and let thedistance FEX = f (focal length), OB f f (conJugate foci)>AXBX = i (for image, intercepted portion),AJZ^ = s (for stadia, intercepted…
Surveying
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