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原文传递 5 Things You Didn't Know about Railroad Surveying

题名：	5 Things You Didn't Know about Railroad Surveying
正文语种：	eng
作者：	Chuck Spinks
摘要：	Surveying has been around for millennia, but it changed in the 19th century when the demand for civil engineering projects, such as canals and railroads, increased. In the early 1860s, two companies - the Central Pacific Railroad and the Union Pacific Railroad (both ASCE Historic Civil Engineering Landmarks)-joined forces to build the first transcontinental railroad. The reconnaissance, preliminary, and location surveys for these railroads were conducted by civil engineers. Here are five things you didn't know about railroad surveying in the 1800s: 1. In 1831, American William J. Young invented the Transit, a rugged, lightweight, easy-to-use alternative to the traditional English theodolite instrument. 2. In the 1830s in the U.S., to more accurately survey roads, canals, and railroads, civil engineers began using 50 ft and 100 ft engineer's chains instead of the 66 ft Gunter's chain.
出版年：	2023
期刊名称：	Civil Engineering
卷：	93
期：	2
页码：	10-10