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acres adjustment alidade axis azimuth base bearings and distances boundary bubble calculate the area centre line chains circle clamp column correction cot tan cot declination arc deflection determine difference direction divided division line east elevation equal equatorial lines error EXAMPLES feet figure grade height horizontal inches indicate instrument intersection latitude and departure length limb located log 00B 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 399 - The mistake above referred to is supposed to have found expression in our legislation ; though it is possible that the real intent of the act to which we shall refer is not what is commonly supposed. An act passed in 1869 (Compiled Laws...
Page 397 - ... the aid of anything on the ground, where it was located. The incorrect record of course becomes worse than useless when the witnesses it refers to have disappeared. It is, perhaps, generally supposed that our town plats were more accurately surveyed, as indeed they should have been, for in general there can have been no difficulty in making them sufficiently perfect for all practical purposes. Many of them, however, were laid out in the woods; some of them by proprietors themselves, without either...
Page 403 - But he would do mischief if he were to attempt to "establish" monuments which he knew would tend to disturb settled rights; the farthest he has a right to go, as an officer of the law, is to express his opinion where the monument should be, at the same time that he imparts the information to those who employ him, and who might otherwise be misled, that the same authority that makes him an officer and entrusts him to make surveys, also allows parties to settle their own boundary lines, and considers...
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 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 398 - ... the ground. Stones might be put around or over these if they were handy, but often they were not, and the witness trees must be relied upon after the stake was gone. Too often the first settlers were careless in fixing their lines with accuracy while monuments remained, and an irregular brush fence, or something equally untrustworthy, may have been relied upon to keep in mind where the blazed line once was. A fire running through this might sweep it away, and if nothing...
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 85 - Whenever the instrument is set in the meridian, as will be hereafter described, the index of the hour arc should read apparent time. If not, loosen the two flat head screws on the top of the hour circle, and with the hand turn the circle around until it does, fasten the screws again, and the adjustment will be complete.
Page 398 - A generation has passed away since they were converted into cultivated farms, and few if any of the original corner and quarter stakes now remain. The corner and quarter stakes were often nothing but green sticks driven into the ground. Stones might be put around or over these if they were handy, but often they were not, and the, witness trees must be relied upon after the stake was gone. Too often the first settlers were careless in fixing their lines with accuracy while monuments remained, and...