A Treatise on Plane SurveyingGinn, 1888 - 498 pàgines |
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Altres edicions - Mostra-ho tot
Frases i termes més freqüents
abscissas acres adjustment alidade altitude angle of elevation Article azimuth base bearings and distances bubble calculate the area centre chains circle clamp computed corner correction declination arc deflection Delta Cassiopeia determine diagonal difference direction divided division line double meridian distance east equal equatorial lines error EXAMPLES feet figure given point Given the bearings height inches indicate instrument intersection latitude and departure length limb line LN line of collimation locate magnetic magnetic bearing MAGNETIC DECLINATION main socket measure method needle object observed obtained parallel perpendicular plate plot Polaris polygon radius reading right angles scale screws side socket solar attachment solar compass solar telescope square stadia station survey surveyor tangent tangent-screw tion township tract of land transit Transit Surveying transit telescope trapezium trapezoid triangle vernier whence wires zero
Passatges populars
Pàgina 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...
Pàgina 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...
Pàgina 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...
Pàgina 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.
Pàgina 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...
Pàgina 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...
Pàgina 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...
Pàgina 400 - ... it nevertheless determined the extent of his possessions, and he gained or lost according as the mistake did or did not favor him.
Pàgina 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.
Pàgina 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...