International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 84
surface. The portion surveyedis conceived to be projected upon a horizontal plane, calleda plane of reference, upon which all inequalities of sur-face as well as all conspicuous objects are shown in theirtrue relative positions. The simplest and most generallyused method of representing the… … Fig. 294. Let A B C/\xv Fig. 294, represent the outline of a hill, andsuppose this hill to be gradually submerged in water, thewater rising in successive heights of 10 feet. The flow, orshore line, at each successive rise is a contour line. Thehorizontal lines correspond to the surfaces of the…
Railroad engineering
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