Congressional Edition Volume 3161, No. 2

Congressional Edition Volume 3161, No. 2

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 edition. Excerpt: ...The method of procedure in the field must necessarily vary according to the apparatus used and the local conditions of the country. An example of the method used with the slide contact bars can be found in reports on the Yolo and Los Angeles bases in the United States Coast and Geodetic Survey Report for 1882, Appendix 8, and Eeport for 1889, Appendix 10. For the method used with the iced steel bar and 100m steel tapes see Professor Woodward's reports on the Hoi ton and St. Albans bases. In the work of measurement the first measure requires time for drilling all persons in precision and rapidity of.action, and a repetition of the measure can be made in much less time than the first and very probably with more accuracy. The rapidity of measurement conduces to accuracy when movable tripod supports are used, because it lessens the liability of change in the position of the bar. For transferring the end of the bar to the ground when measurement is suspended various forms of apparatus hav e been used. For end contact bars some form of transit sector is generally used. It is set up at right angles to the base, opposite to the end of the bar, the terminal of which is transferred by means of it to a scale placed on the ground mark. When the optical measuring apparatus is used, the Repsold cut-oft-is preferred, a description of which can be.found in the Report of the Lake Survey. THE ACCURACY ATTAINABLE IN BASE MEASUREMENTS. The great importance to geodesy of the adoption of the metre as the international unit of length need not be pointed out, but the establishment of an International Bureau of Weights and Measures for the comparison of standards is here adverted to, not oidy in recognition of its eminent services to geodesy, but because its work must...
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Product details

  • Paperback | 202 pages
  • 189 x 246 x 11mm | 372g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236494814
  • 9781236494818