International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 148
eat care, as the correctness of all the subsequentmeasurements depends upon the degree of accuracy withwhich these primary lines are measured. 1343. Base Lines and Subdivisions.—The rect-angular method of surveying town sites is illustrated inFig. 327, in which A B is the principal base, and the… … from which it is separated by a 25-foot alleyway and onetier of lots 125 feet deep. Avenues are 100 feet in width, 738 LAND SURVEYING. streets 60; blocks 250 feet by GOO feet, fronting 250 feet onthe avenues, and the lots are 25 feet by 125 feet. The initial point A of the principal base A B is the…
Railroad engineering
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
