Rudiments of the art of building : in five sections : general principles of construction, materials used in building, strength of materials, use of materials, working drawings, specifications and estimates (1871)
140 RUDIMENTS OF THE bench marks, written B M, and are essential (ov eitbei checking the work or carrying it on at a subsequent period. 282. The reduction of the levels to a tabular form for use IS a simple arithmetical operation, which will be readily understood by examination of the annexed… … The difference between the successive readings in any set of observations is the difference of level between the points where the staff was successively held up, and by simple addition or subtraction, according as the ground rises or falls, we might obtain the total rise or fall of the ground above…
Building · Building materials · Engineering
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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