Treatise On Levelling Topography And Higher Surveying
Treatise On Levelling Topography And Higher Surveying
W M William Mitchell Gillespie
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Grade or slope is not a straight line. Calling the globe spherical, this line, when traced in the plane of a great circle, would be a log- arithmic spiral. On a length of six miles, the difference in the middle between it and its straight chord would be six feet. PART II. INDIRECT LEVELLING. CHAPTEE I. METHODS AND INSTRUMENTS. (87. ) Vertical Surveying. Levelling may be named VER-. TICAL SURVEYING, or Up-and-down Surveying ; Land Sur- veying being HORIZONTAL SURVEYING, or Right-and-left and For...e-and-aft Surveying. AH the methods of determining the position of a. Point in horizontal surveying, may be used in vertical surveying. The point may be determined by coordinates situated in a vertical plane, as in any of the systems employed in L. S. (Part I. , Chapter I. ), in a horizontal plane. Pio M Thus, if a balloon be held down by a sin- gle rope attached to a point in a level sur- face, its height above that surface is found by measuring the length of the rope. This is the Direct Method.
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