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adjustment alidade arithmetical mean azimuth back sight base line bench marks bottom element bubble line calculated chaining pins compass Compute contour contour lines corners correct cross-hairs cross-section curve determine distance dumpy level elevation engineers Equipment.—Transit error of closure eyepiece feet field notes flag pole fore sight grade line graduated head chainman horizontal inch instrument justment latitudes length leveling rod line of collimation means measured method monuments nearest 0.1 foot needle observations parallel party pegs perpendicular plane table plat plate levels plumb bob Polaris precision principal meridian probable error PROBLEM Problem.—Determine Problem.—Make railroad record resurvey rod readings scale Set the transit sextant shown slide rule slope solar spring balance stadia standard station number steel tape survey surveyors tangent target telescope tion topographic township triangle tripod trom true meridian turning points vernier vertical axis wye level zero
Page 161 - And the boundary lines which shall not have been actually run and marked as aforesaid shall be ascertained by running straight lines from the established corners to the opposite corresponding corners...
Page 161 - That the surveyor general shall cause the townships west of the Muskingum, which, by the above-mentioned act, are directed to be sold in quarter townships, to be subdivided into half sections of three hundred and twenty acres each, as nearly as may be, by running parallel lines through the same from east to west, and from south to north...
Page 169 - That in a fractional section where no opposite corresponding corner has been or can be established, any required subdivision line of such section must be run from the proper original corner in the boundary line due east and west, or north and south, as the case may be, to the water course, Indian reservation, or other boundary of such section, with due parallelism to section lines.
Page 168 - An obliterated corner is one where no visible evidence remains of the work of the original surveyor in establishing it. Its location may. however, have been preserved beyond all question by acts of landowners, and by the memory of those who knew and recollect the true situs of the original monument. In such cases it is not a lost corner. A lost corner is one whose position cannot be determined, beyond reasonable doubt, either from original marks or reliable external evidence.
Page 161 - The boundary lines. actually run and marked in the surveys returned by the surveyor-general, shall be established as the proper boundary lines of the sections, or subdivisions, for which they were intended, and the length of such lines, as returned, shall be held and considered as the true length thereof.
Page 168 - Government surveyors shall be placed on the straight lines joining the section and quarter-section corners and midway between them, except on the last half mile of section lines closing on the north and west boundaries of the township, or on other lines between fractional sections.
Page 144 - Theory. — The principle upon which the sextant is constructed is that if a ray of light is reflected successively between two plane mirrors, the angle between the first and last direction of the ray is twice the angle of the mirrors. In (b), Fig. 31, the angles of incidence and reflection are equal, i = r and i...
Page 163 - Standard Parallels. — Standard parallels, which are also called correction lines, shall be extended east and west from the principal meridian, at intervals of 24 miles north and south of the base line, in the manner prescribed for running said line, and all requirements under the title ' Base Line
Page 168 - That the original township, section, and quarter-section corners established by the Government surveyors must stand as the true corners which they were intended to represent, whether the corners be in, place or not.
Page 145 - To make the index glass, 7, perpendicular to the plane of the limb, bring the vernier to about the middle of the arc and examine the arc and its image in the index glass. If the glass is perpendicular to the plane of the limb, the image of the reflected and direct portions will form a continuous curve. Adjust the glass by means of the screws at the base. Horizon Glass. — To make the horizon glass, H, parallel to the index glass, 7, for a zero reading: With the vernier set to read zero, sight at...