Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 66
are of the length of the standard: the square of the length of the chain used:: the area found: the true area. SECTION II. AREA OR CONTENTS OF GROUND. 83. The surface of ground being, in general, broken anduneven, it is impossible, without great trouble and expense,to ascertain its exact area or… … Fig. 45. zontal, and its area as measured by that portion of thehorizontal plane which the boundary lines enclose. For example, if ABCD were apiece of ground, having an unevensurface, the whole would be referredto a horizontal plane, and that partof the plane which is included be-tween the bounding…
Surveying
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