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adjustment alidade ang/e angle arithmetical mean azimuth back sight base line bench marks bubble line Calculate 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 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 rodman scale Set the transit sextant shown slide rule slope solar spring balance square root stadia stakes standard steel tape survey tangent target telescope tion topographic triangle tripod trom true meridian turning points vernier vertical axis wye level zero
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 161 - ReviaVds'tatutes' corners of half and quarter sections not marked shall be placed as nearly as possible " equidistant from those two corners which stand on the same line." This act further provides that "the boundary lines actually run and marked " (in the field) " 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 by either of the surveyors aforesaid shall be held and considered as the true length...
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 - 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 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 163 - Standard Parallels. — Standard parallels, which are also called correction lines, are extended east and west from the principal meridian, at intervals of 24 miles north and south of the base line. They are surveyed like the base line.
Page 100 - Plate 13 the angle a represents the azimuth of the line AB. The bearing of a line is the horizontal angle which it makes with a north and south line ; it is usually expressed in a value less than 90° and, therefore, it is sometimes measured from the north point and sometimes from the south point, clockwise or counterclockwise. In Plate 13, the angle /3 represents the bearing of the line AB.