A Treatise on Land-surveying: Comprising the Theory Developed from Five Elementary Principles; and the Practice with the Chain Alone, the Compass, the Transit, the Theodolite, the Plane Table, &c. : Illustrated by Four Hundred Engravings, and a Magnetic Chart |
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Common terms and phrases
acres angle applied base Bearing calculated called centre chains CHAPTER circle compass convenient corner correct course described desired determined diagonal difference direction distance divided division draw drawn East equal error Example explained feet field figure fixed four give given ground half inch intersection known Latitude Latitudes and Departures length letters marked means measured Meridian method miles move needle North noted object observed obtained offsets operation opposite original parallel pass perpendicular plane plat plate position preceding precisely reading represent rule scale screws seen side sight similar South space square star station straight line survey Table taken telescope third tion township Transit triangle true turn usually Variation Vernier vertical West
Popular passages
Page 153 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Page 4 - ... shall be specially noted, and added to or deducted from the western or northern ranges of sections or half-sections in such township, according as the error may be in running the lines from east to...
Page 313 - 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...
Page 10 - President may prescribe, to cause the lands thus situated to be surveyed in tracts of two acres in width, fronting on any river, bayou, lake, or watercourse, and running back the depth of forty acres...
Page 267 - heliotrope," which is a piece of looking-glass, so adjusted as to reflect the sun directly to any desired point, is the most perfect arrangement. For night signals, an Argand lamp is used ; or, best of all, Drummond's light, produced by a stream of oxygen gas directed through a flame of alcohol upon a ball of lime. Its distinctness is exceedingly increased by a parabolic reflector behind it, or a lens in front of it. Such a light was brilliantly visible at 66 miles distance.
Page 155 - When the bounds are given by compass-bearings, the surveyor must be reminded that these bearings are very far from being the same now as originally, having been changing every year. The method of determining this important change, and of making the proper allowance, will be found in Chapter VIII, of this Part. (261) Town Surveying, Begin at the meeting of two or more of the principal streets, through which you can have the longest prospects. Having fixed the instrument at that point, and taken the...
Page 6 - ... (either of which would indicate an important error in the surveying,) the lines must be retraced, even if found necessary to remeasure the meridional boundaries of the township, (especially the western boundary,) so as to discover and correct the error ; in doing which, the true corners must be established and marked, and the false ones destroyed and obliterated to prevent confusion in future ; and all the facts must be distinctly
Bibliographic information
| Title | A Treatise on Land-surveying: Comprising the Theory Developed from Five Elementary Principles; and the Practice with the Chain Alone, the Compass, the Transit, the Theodolite, the Plane Table, &c. : Illustrated by Four Hundred Engravings, and a Magnetic Chart |
| Author | William Mitchell Gillespie |
| Edition | 5 |
| Publisher | D. Appleton & Company, 1857 |
| Original from | Harvard University |
| Digitized | 30 Jan 2008 |
| Length | 524 pages |
| Export Citation | BiBTeX EndNote RefMan |