A Treatise on Surveying: Comprising the Theory and the PracticeD. Appleton and Company, 1887 - 692 pàgines |
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Altres edicions - Mostra-ho tot
A Treatise on Surveying: Comprising the Theory and the Practice, Volum 1 William Mitchell Gillespie Visualització completa - 1897 |
A Treatise on Surveying: Comprising the Theory and the Practice, Volum 1 William Mitchell Gillespie Visualització completa - 1901 |
A Treatise on Surveying: Comprising the Theory and the Practice, Volum 1 William Mitchell Gillespie Visualització completa - 1896 |
Frases i termes més freqüents
acres adjustment alidade angle axis back-sight bearing bisect bubble calculated celestial sphere circle compass contour-lines convenient corner correct Cosine Cotang course cross-hairs declination desired determined diagonal direction distance divided division draw drawn east equal error feet field field-notes figure given line given point ground half horizontal inch instrument intersection latitudes and departures length line of sight longitude MAGNETIC BEARINGS main socket marked measured meridian method miles move needle object observed obtained offsets parallel passing perpendicular plane plat plate plumb-bob plumb-line precisely protractor radius reading right angles scale screws sextant side similar triangles Sine slope solar compass square chains stake station straight line subtract surface survey Tang telescope thalwegs theodolite tion township transit triangle tube turn vernier vertical
Passatges populars
Pàgina 293 - And 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.
Pàgina 513 - Every circumference is regarded as being divided into 360 equal parts, called degrees. Each degree is divided into 60 equal parts, called minutes, and each minute into 60 seconds. These divisions are indicated by the marks ° ' ". Thus 28 degrees, 17 minutes, and 49 seconds, are written 28° 17
Pàgina 305 - Prior to piling up the earth, in a cavity, formed at the corner boundary point, is to be deposited a stone, or a portion of charcoal; or a charred stake is to be driven twelve inches down into such center point to be a witness for the future.
Pàgina 299 - ... to be surveyed in tracts of two acres in width, fronting on any river, bayou, lake, or water-course, and running back the depth of forty acres...
Pàgina 304 - From quarter section and meander corners two bearing trees are to be marked, one within each of the adjoining sections. Stones at township corners (a small monument of stones being alongside thereof) must have six notches cut with a pick or chisel on each edge or side towards the cardinal points ; and where used as section corners on the range and township lines, or as section corners in the interior of a township, they will also be notched by a pick or chisel, to correspond with the directions given...
Pàgina 298 - ... vary the mode heretofore prescribed by law, so far as relates to the contents of the tracts, and to the angles and boundary lines, and to lay out the same into tracts as far as practicable, of fifty-eight poles in front and four hundred and sixty-five poles in depth, of such shape, and bounded by such lines as the nature of the country will render practicable, and most convenient: Provided however.
Pàgina 292 - ... six miles square, — two things involving in connection a mathematical impossibility — for, strictly to conform to the meridian, necessarily throws the township out of square, by reason of the convergency of meridians...
Pàgina 304 - Whenever bearing trees are not found, MOUNDS of earth, or stone, are to be raised around posts on which the corners are to be marked in the manner aforesaid. Wherever a mound of earth is adopted, the same...
Pàgina 301 - ... traced, the blazes to be opposite each other, coinciding in direction with the line where the trees stand very near it, and to approach nearer each other, the further the line passes from the blazed trees. Due care must ever be taken to have the lines so well marked as to be readily followed.
Pàgina 10 - If foot for each degree of Fahrenheit. If a wind blows with or against the movement of the sound, its velocity must be added or subtracted. If it blows obliquely, the correction will evidently equal its velocity multiplied by the cosine of the angle which the direction of the wind makes with the direction of the sound.* If the gun be fired at each end of the base in turn, and the means of the times taken, the effect of the wind -will be eliminated. If a watch is not at hand, suspend a pebble to a...