Surveying ; a manual of practical instruction in the art of plane surveying, including plotting, leveling, triangulation, line running, cross-sectioning, traversing, and other details of field work (1910)
American School of Correspondence, Phillips, Alfred Edward, 1863- [from old catalog] · Chicago, American school of correspondence · leaf 185
s, varnished and tipped with metal. The rodswere supported in trestles, the contacts between the ends beingmade with great care. Later, compensated rods were employed, aafor instance the Contact-Slide Apparatus of the U. S. Coast Surveyand the Ilepsold primary base bars of the U. S. Lake Survey,… … ■•^v^^^fUgI^»^ Fig. 119. Within recent years the steel fajie has becoule popular as theaccuracy attainable with its use has become more fully appreciated. Errors in Base rieasurement. The following are the chiefsources of error m base measui-ement: 1. Changes of temperature ; 2. Difficulties of…
Surveying
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