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acres adjustment alidade axis azimuth base bearings and distances boundary bubble calculate the area centre line chains chord circle clamp column correction cot tan cot declination arc deflection determine diagonal difference direction divided division line east equal equatorial lines error EXAMPLES feet figure grade ground height horizontal inches indicate instrument intersection latitude and departure length limb located log cot log log tan log magnetic Magnetic Declination main socket marked measure method miles needle object observed obtained parallel perpendicular plate plot polar polygon position principal meridian radius random line reading refraction right angles scale screws side sight sine solar compass square station straight edge streets surface survey surveyor tan cot tan tangent tangent-screw tape telescope tion township transit Transit Surveying trapezium trapezoid triangle true line vernier whence wires
Page 297 - He shall cause to be surveyed, measured, and marked, without delay, all base and meridian lines through such points and perpetuated by such monuments, and such other correction parallels and meridians as may be prescribed by law or by instructions from the General Land Office in respect to the public lands within his surveying district, to which the Indian title has been or may be hereafter extinguished.
Page 402 - Now it may perhaps be known in a particular case that a certain monument still remaining was the starting-point in the original survey of the town plat ; or a surveyor settling in the town may take some central point as the point of departure in his surveys, and assuming the original plat to be accurate, he will then undertake to find all streets and all lots by course and distance according to the plat, measuring and estimating from his point of departure. This procedure might unsettle every line...
Page 298 - ... in all cases where the exterior lines of the townships thus to be subdivided into 'sections, or half sections, shall exceed, or shall not extend six miles, the excess or deficiency shall be specially noted, and added to or deducted from the western and northern ranges of sections or half sections in such township, according as the error may be, in running the lines from east to west or from south to north.
Page 297 - ... the sections shall be numbered, respectively, beginning with the number one, in the northeast section, and proceeding west and east alternately, through the township, with progressive numbers, till the thirty-sixth be completed.
Page 397 - WHEN a man has had a training in one of the exact sciences, where every problem within its purview is supposed to be susceptible of accurate solution, he is likely to be not a little impatient when he is told that, under some circumstances, he must recognize inaccuracies, and govern his action by facts which lead him away from the results which theoretically he ought to reach. Observation warrants us in saying that this remark may frequently be made of surveyors.
Page 284 - ... of the tripod. Then carefully turn the arm half way over, until it rests upon the adjuster by the opposite faces of the rectangular blocks, and again observe the position of the sun's image. If it remains between the lines as before, the...
Page 296 - The plats of the townships respectively, shall be marked by subdivisions into lots of one mile square or 640 acres, in the same direction as the external lines, and numbered from 1 to 36...
Page 400 - ... it nevertheless determined the extent of his possessions, and he gained or lost according as the mistake did or did not favor him.
Page 298 - ... bounded on the northern and western lines of such townships shall be sold as containing only the quantity expressed in the returns and plats respectively, and all others as containing the complete legal quantity.
Page 408 - ... owners are fixed by their purchase; when making that, they have a right to understand that all land between the meander lines, not separately surveyed and sold, will pass with the shore in the government sale and, having this right, anything which their purchase would include under it cannot afterward be taken from them. It is believed, however, that the Federal courts would not recognize the applicability of this rule to large navigable rivers, such as those uniting the Great Lakes. On all the...