Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 238
adjacent stations ofthe field. Eind the difference between the sum of the hind-sights and the sum of the foresights. What should thisdifference equal ? SECTION VIII THE PLANE TABLE Description and Uses. The plane table, an approved form ofwhich is shown in Eig. 23, consists mainly of a drawingboard… … Fig. 23. The Plase Table 250 SURVEYING The board is provided with rollers or clamps or both, forkeeping the paper secure and even. The plumbing arm hasits end brought to a point which, however placed on thepaper, is directly above the corresponding point on the grounddetermined by the plummet. The…
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