General regulations for the Army, or, Military institutes (1825) (14578873627)

Identifier: 0255001.nlm.nih.gov
Title: General regulations for the Army, or, Military institutes
Year: 1825 (1820s)
Authors: United States. War Dept Scott, Winfield, 1786-1866
Subjects: Military Personnel Government Regulation
Publisher: Washington : Printed by Davis and Force
Contributing Library: U.S. National Library of Medicine
Digitizing Sponsor: Open Knowledge Commons, U.S. National Library of Medicine



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in 17 continued
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.si :1 Engineer Department, Art. 67. 9 FORM 17.—Continued.The following method should be adopted in conducting Trigo-nometrical Surveys for the Secondary Triangles.I See Plate No. 2, for the figure.) Let A B be the given base from which the triangulationis to be commenced. The theodolite being placed at A, fixthe verniers at 0 and 180° on the graduated plate; 0 to bebelow the eye glass of the telescope—turn the whole instru-ment until the station B is seen through the telescope, thenclamp the theodolite firmly. The graduated plate being thusfixed, take the angles, made by the lines A D, A C, with the baseA B. Write the angles in the note book as the verniers in-dicate on either side. (The theodolite is supposed to begraduated to 360°, and to have verniers on opposite sides.)From the station B, the same process is to be gone throughthat took place at A. The position of verniers of the in-strument may be retained as they were at A, when lookingtoward B, or the 180° may be turned