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Home > Art, Film & Photography > The Aims and Methods of Cartography; With Especial Reference to the Topographic Maps Now Under Construction in Maryland by the United States Geologica
The Aims and Methods of Cartography; With Especial Reference to the Topographic Maps Now Under Construction in Maryland by the United States Geologica

The Aims and Methods of Cartography; With Especial Reference to the Topographic Maps Now Under Construction in Maryland by the United States Geologica


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About the Book

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. 1898 edition. Excerpt: ...it has four different motions, two about its horizontal axis and two about its vertical axis, each of which can be separately bound or controlled by clamps or friction movements. To use the Steinheil, it is screwed into some wooden upright, as the side of a tree, in such a position that the main axis carrying the lens and plaster of Paris reflector shall be parallel to the sun's rays. The observer standing behind the mirror receives from the rear surface of the glass a reflection of the sun, producing an imaginary sun. The mirror should not be moved until this imaginary sun, moving with it, appears to rest on the object to which the flash is to be cast, as the hill on which the triangulator is standing. As both surfaces of the mirror are parallel, the true reflected rays of the sun from the surface of the mirror will also be cast on the object sighted to. This instrument is in great favor because it is light and convenient to carry and use, and because there are no movable parts to get out of adjustment by jarring. This latter is a serious defect in the Coast Survey instrument, since unless frequently tested the two rings may have moved, thus causing the reflection to be cast out of parallelism with the line of sight of the telescope. The use of heliotropes presupposes the employment of men to operate them, thus increasing materially the expense of the work. Misunderstandings continually arise between the heliotropers and the observer, causing vexatious delays, and therefore their employment should be avoided whenever possible. THEODOLITES FOR TRI ANGULATION. Instruments differing widely in power and degree of accuracy arc in use for the measurement of angles in primary triangulation, depending upon the extent of the work and the degree...


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Product Details
  • ISBN-13: 9781130382358
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 30
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130382354
  • Publisher Date: 05 May 2014
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 73 gr


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The Aims and Methods of Cartography; With Especial Reference to the Topographic Maps Now Under Construction in Maryland by the United States Geologica
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