## Treatise on Surveying |

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### Common terms and phrases

acres adjustment angle axis back-sight bearing bisect bubble calculated celestial sphere chord circle compass corner cosec Cosine Cotang course cross-hairs declination desired determined diagonal difference direction distance divided division draw drawn east equal feet field field-book field-notes figure given line given point ground Gunter's chain half height horizontal inch instrument intersection latitudes and departures length line of sight longitude magnetic MAGNETIC BEARINGS main socket marked measured method miles move needle object obtained offsets parallel passing perpendicular plane plat plate plumb-line protractor quadrilateral radius reading right angles scale screws side similar triangles Sine solar compass square chains stake station straight line subtract survey surveyor tance Tang Tangent telescope tion township trapezoid triangle tube turn vernier vernier scale vertical

### Popular passages

Page 345 - AN ACT providing for the sale of the lands of the United States in the Territory NORTHWEST of the Ohio, and above the mouth of the Kentucky river...

Page 303 - ... 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 401 - 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' 49" Fractions of a second are best expressed decimally.

Page 401 - Every circumference of a. circle, whether the circle be large or small, is supposed to be divided into 360 equal parts called degrees. Each degree is divided into 60 equal parts called minutes, and each minute into 60 equal parts called seconds.

Page 314 - 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...

Page 311 - ... 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...

Page 308 - ... 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.

Page 191 - This application of the Telescope may be considered as completely annihilating that part of the error of observation which might otherwise arise from an erroneous estimation of the direction in which an object lies from the observer's eye, or from the centre of the instrument. It is, in fact, the grand source of all the precision of modern Astronomy, without which all other refinements in instrumental workmanship would be thrown away.

Page 302 - ... 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...

Page 305 - E., and proceed as with townships situated " north and west," except that the random or trial lines will be run and measured west, and the true lines east, throwing the excess over or deficiency under four hundred and eighty chains on the west end of the line, as required by law ; wherefore...