A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 355
(Fig.505). The closer the con-tours the steeper the slope.If the planes be taken atsome even distance apart—one, five, ten, or twen-ty feet, etc.—the elevationof any point upon the sur-face will be determined. Shore lines of stillwater are an illustrationof contours. The horizontal planes*whose…
Surveying
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