United States Exploring Expedition. During the Year 1838, 1839, 1840, 1841, 1842 Volume 13 - Couverture rigide

Couverture rigide

ISBN 10 : 134470090X ISBN 13 : 9781344700900

Editeur : Arkose Press, 2015

Synopsis

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A propos du livre

Présentation de l'éditeur

The vessels having reached their assigned places hove-to, and the boats having been previously despatched, would about the same time have anchored in their assigned stations, at the points of reefs, and hoisted their appropriate signals. The vessel that is first to fire a gun then hoists an ensign at the foremast-head, which is answered by all, and the flag is in like manner displayed previous to each successive fire. The firing then goes on in quick succession from all the vessels ;and at the time, all the officers being on deck for the purpose, angles are measured between the other vessels and objects on the shore, each by a different observer, as directed and indicated by the senior officer present ;these angles, together with those made by the visual tangents to the shore, have always been found sufficient to plot from. During this operation the ensign is kept hoisted at the peak, so that all the angles may be taken simultaneously; and at the same time, the altitude and azimuth of the masts of the ships is observed from the boats, for the purpose of determining their position more accurately. Altitudes of the sun for time, and angles whence to calculate the azimuth of some one of the objects, are also taken immediately before or after the horizontal angles. When the duties at the first station have been finished the vessels and boats change positions alternately, and at each change the same operations are repeated. To illustrate still further the mode in which the whole squadron was made to concur in obtaining unity of action, a detail of a survey and a plot of the work are given on Plate 1, Fig. 1. By these alternate changes in the stations of the several vessels and boats, continued until a circuit of the island has been made, the work is finished, and when it joins, it is proved by the last distance determined by azimuthal angles and base by sound, as
(Typographical errors above are due to OCR software and don't occur in the book.)

Détails de l'édition

• Éditeur: Arkose Press
• Date d'édition: 2015
• Langue: anglais
• ISBN 10: 134470090X
• ISBN 13: 9781344700900
• Reliure: Relié
• Nombre de pages: 706
• Coordonnées du fabricant: non disponible
• Personne responsable: non disponible