Practical Geodesy: Comprising Chain Surveying, and the Use of Surveying Instruments; Levelling, and Tracing of Contours; Together with Trigonometrical Colonial Mining and Maritime Surveying

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J. W. Parker and son, 1855 - Surveying - 272 pages

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Page 10 - Upon the same base, and on the same side of it, there cannot be two triangles that have their sides which are terminated in one extremity of the base equal to one another, and likewise those which are terminated in the other extremity.
Page 212 - ... to make the objects appear on the other wire ; if the contact still remains perfect, the axis of the telescope is in proper adjustment ; if not, it must be altered by moving the two screws which fasten, to the up-and-down piece, the collar into which the telescope screws. This adjustment is not very liable to be deranged.
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