Items related to The assistant engineer's guide in boring; with...
The assistant engineer's guide in boring; with full description of tools and methods of proceeding, and remarks on British strata and their contents as materials in construction ... - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1846 Excerpt: ...it a far preferable instrument.-Suppose that from A we have In ranging out a line, the less the number of times the theodolite is planted, the less the chances of error; therefore, in ranging out a line of any length, attention should be given to favourable positions for planting the instrument; such care ensures better work, and saves trouble. f See Simms on Surveying and Levelling Instruments, as also his " Public Works of Great Britain." ranged out through a, b, c, &c, to B, iu the direction C; instead of proceeding to B at once, and by back sights ranging out towards C, it will be found preferable, on most occasions, to stop at c or f, and by means of g B, sight on in the required direction; besides that, by stopping at d or e, both methods may be employed. 182. As soon as the ranging out has com-stumping. menced, square stakes, about 2i inches by 2£ inches, and 2 feet in length, must be driven into the ground to the depth of 1 ft. 9 inches, at exactly 1 chain apart, and a stake must also be driven in exactly at the junction of curves with straight lines. 183. Straight lines tangent to curves must in straight line. all cases be produced so as to reach beyond the tangent to x. curves. works, and a pole driven firmly in, so as to remain for permanent reference during the execution of the works thus:--by means of these poles at each end of the straight lines tangent to Fig. 50. curves, any point on the straight line can afterwards be found, when the centre stakes and the nick have disappeared. 184. The greatest care must be taken to make curves mutt the curves joining the straight lines perfectly tan-1p"Uy straight lines. The chain should be carefully tested for this work. Commencement of curves lo be particularly marked. Nicking ou...
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