Miscellaneous Documents Volume 32; V. 36

Miscellaneous Documents Volume 32; V. 36

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1847 edition. Excerpt: ...once since the measurement by assistant Gerdes, and th.eir condition reported. The whole time occupied by myparty at the base, including the landing and reshipping of the apparatus, the pitching and striking the camp, and its removal from the east end towards the west end, the measurem-ent, placing monuments, 'trials of apparatus, &c., was six weeks, namely, fromthe 30th of April to the 12th of June. The final measurement (occupying 27 days) was commenced on the 12th of May and ended with the 8th of June, including in this period three days, when the camp was removed, and four Sundays. We were much indebted to Major Ogden, of the corps of engineers, for the' important' facilities' which he afforded us. 2. Primary and secondary triangulations.--B0th these triangula-r tions, (see sketch E, ) have been under the general direction of assistant F. H. Gerdes, who has chiefly executed personallyIthe ppimary triangulation.' Four stations have been occupied, three on the main near Pascagoula, and one on' Horn Island, and observations made on 21 points with the eighteen inch Troughton theodolite of the coast survey. A special reconnaissance was also made to re'--examine the secondary signals as far west as Cat Island. Mr. Gerdes also made all the arrangements, previous to the measure _ment of the base on Dauphin-Island, which were in every respect satisfactory. The schooner Walker has afforded means of transpor tation for.this party and the one engaged in astronomical observations. 3. flstronomical observations---Observations for i latitude and azimuth have been made by assistant R. H. Fauntleroy at two stations; Fort Morgan at the entrance of Mobile bay, and East Picagoula in Mississippi. A zenith and.show more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236989058
  • 9781236989055