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adjustment alidade arithmetical mean assigned azimuth back sight base line bench marks bubble line calculated chaining pins compass Compute contour contour lines corner correct cross-hairs 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 hour angle instrument justment latitudes length leveling rod line of collimation Mean Solar means measured method nearest 0.1 foot needle observations parallel 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 stadia stakes standard station number steel tape survey surveyors tangent target telescope tion topographic traverse triangle tripod trom true meridian turning points vernier vertical axis vertical circle wye level zero
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 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 74 - Make the element level with the foot screws and bring the bubble to the middle by means of the altitude adjusting screws. The element is made level by the method of reversions as follows : With the level clamped over a pair of foot screws, as above, lift the clips and level up precisely; cautiously lift the telescope out of the wyes, turn it end for end, and very gently replace it in the wyes ; if the bubble moves, bring it half way back by means of the foot screws. Before disturbing adjusting screws...
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 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), Pig. 31, the angles of incidence and reflection are equal, i = r and i...
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.
Page 38 - AG, into an even number of equal parts, and erect ordinates at the points of division; then add together the first and last ordinates, twice the sum of all the other odd ordinates, and four times the sum of all the even ordinates ; multiply the sum by one-third of the common distance between any two adjacent ordinates.