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File:A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. (14596232529).jpg

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Identifier: treatiseonlandsu00gill (find matches)
Title: A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart
Year: 1875 (1870s)
Authors: Gillespie, W. M. (William Mitchell), 1816-1868
Subjects: Surveying
Publisher: New York, D. Appleton
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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findDC, one calculation checking the other. DC then becomes a baseto calculate EF; which is then used to find GH ; and so on. The fewer primary stations used, the better; both to preventconfusion and because the smaller number of triangles makes thecorrectness of the results more probable. The United States Coast Survey, under the superintendence ofProf. A. D. Bache, displays some fine illustrations of these pruici-ples, and of the modifications they may undergo to suit variouslocalities. The figure on the opposite page represents part of thescheme of the primary triangulation resting on the Massa-chusetts base and including some remarkably well-conditionedtriangles, as well as the system of quadrilaterals which is a valuablefeature of the scheme when the sides of the triangles are extendedto considerable lengths, and quadrilaterals, with both diagonalsdetermined, take the place of simple triangles. The engraving is on a scale of 1: 1200,000. PART y TRIANGULAR SURVEYING. 235 Fis:. 258
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266 TRIANGULAR SURVEYING. (part y (384) Signals. They must be high, conspicuous, and so madethat the instrument can be placed precisely under them. Three or four timbers framed into a Fig- 259. pyramid, as in the figure, with a long mastprojecting above, fulfil the first and lastconditions. The mast may be made verti-cal by directing two theodolites to it and ad-justing it so that their telescopes follow itup and down, their lines of sight being atright angles to each other. Guy ropesmay be used to keep it vertical. A very excellent signal, used on the Massachusetts State Survey,by Mr. Borden, is represented in the three following figures. It

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  • bookid:treatiseonlandsu00gill
  • bookyear:1875
  • bookdecade:1870
  • bookcentury:1800
  • bookauthor:Gillespie__W__M___William_Mitchell___1816_1868
  • booksubject:Surveying
  • bookpublisher:New_York__D__Appleton
  • bookcontributor:University_of_California_Libraries
  • booksponsor:Internet_Archive
  • bookleafnumber:272
  • bookcollection:cdl
  • bookcollection:americana
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30 July 2014

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