A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 333
ments. It is usu<ally a rectangular board of well-seasoned i»ine, arranged in sections so as to prevent warping, abouttwenty inches wide and thirty long. The paper to be drawn uponmay be attached to it by tlmmb tacks, or by clamping plates fixedon its sides for that purpose, or by springs… … is by means of a ball-and-socket joint capable of being damped inposition when the table has been leveled and oriented. The plane-table movement shown in Fig. 493 is an improvedform that has been adopted by the United States Geological Survey. The improvement provides a means whereby the table,…
Surveying
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