. Building and repairing railways . ative and the outlook is favorable, the secondstep is now taken which is to make a Prelimin-ary Survey; this duty falls to the lot of a civilengineer, generally called a locating engineer,who takes the field with his corps of instruments the locating engineer will re-quire in this work will be (a) a hand level, (b)an aneroid barometer, (c) a field glass, (d) aprismatic compass, (<?) a pedometer and (/) a 50ft. steel tape. The party will, of course, be fur-nished with the necessary stationery and kindredsupplies. The organization of the forc
. Building and repairing railways . ative and the outlook is favorable, the secondstep is now taken which is to make a Prelimin-ary Survey; this duty falls to the lot of a civilengineer, generally called a locating engineer,who takes the field with his corps of instruments the locating engineer will re-quire in this work will be (a) a hand level, (b)an aneroid barometer, (c) a field glass, (d) aprismatic compass, (<?) a pedometer and (/) a 50ft. steel tape. The party will, of course, be fur-nished with the necessary stationery and kindredsupplies. The organization of the force making the pre-liminary survey will vary according to the char-acter of the country and other considerations,such as the resources of the projectors and thedegree of haste required, the latter factor beingoften controlled by financial considerations, orthe probability of an invasion of the field byrivals. (58) THE PRELIMINARY SURVEY. 59 If the proposed line is a new one, the chief en-gineer will probably take direct charge of the. Fig. 12. ENGINEERS TRANSIT WITH LEVEL AND VERTICAL to take vertical and horizontal angles; also to extend straight level enables approximate elevations to be taken within limited dis-tances. The vertical arc is used for taking vertical angles. work; if on the other hand it is an extension ofan existing system, a locating engineer will have 60 BUILDING AND REPAIRING RAILWAYS. charge, acting in subordination to the chief en-gineer of the system.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
