A Manual of Field and Office Methods for the Use of Students in SurveyingEngineering News Publishing Company, 1904 - 252 Seiten |
Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
adjustment alidade arithmetical mean assigned azimuth back sight base line bench marks bubble line calculated chaining pins compass Compute contour corners correct cross-hairs cross-section curve determine diagram Dist distance dumpy level elevation engineers Equipment.-Transit error of closure eyepiece feet field notes flag pole fore sight grade line head chainman horizontal hour angle inch instrument intersection justment Latitude length level line leveling rod line of collimation magnetic magnetic declination Mean Solar means measured method 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 sextant slide rule slope solar spring balance stadia standard steel tape survey surveyors tack tangent target telescope tion topographic traverse triangle true meridian turning points vernier vertical axis wye level zero
Beliebte Passagen
Seite 149 - 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...
Seite 157 - 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.
Seite 149 - 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...
Seite 156 - 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.
Seite 156 - 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.
Seite 149 - 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.
Seite 156 - 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.
Seite 151 - 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.
Seite 134 - 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), Pig. 31, the angles of incidence and reflection are equal, i = r and i...
Seite 92 - 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.