## A Treatise on Surveying: Comprising the Theory and the Practice, Part 2 |

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### Contents

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### Common terms and phrases

accuracy accurate adjustment alidade altitude apparatus axis azimuth barometer base base-line bubble centimetres chronometer Ci Ci Ci clamp co-ordinates Coast and Geodetic collimation computation contours correction corresponding curvature curves desired determined difference direction earth edge elevation ephemeris equal equation feet formula give given graduation hachures height hence horizontal hour angle inches instrument intersection interval latitude length line of sight located longitude mean measured mercury meridian method metres micrometer millimetres necessary object observed obtained parallel perpendicular plane table plotted plumb line pole position probable error protractor reading reduced reference refraction represent right ascension scale screw sextant shown side sidereal signals slope spheroid stadia star station mark surface tangent tape telescope temperature theodolite tion topography transit triangulation tube United States Coast usually vernier vertical angle wire zenith distance

### Popular passages

Page 22 - If we now add 8 feet to tripod and 8 feet to signal-pole, the visual ray would certainly pass 6 feet above the tangent point, and 20 feet of the pole would be visible from A. II. Elevations required at given distances. — If it is desired to ascertain whether two points in the reconnaissance, estimated to be 44 miles apart, would be visible one from the other, the natural elevations must be at least 278 feet above mean tide, or one 230 feet, and the other 331 feet, etc. This supposes that the intervening...

Page 339 - Rule 2. — When the point sought is without the great circle it is always on the same side of the line from the most distant point as the intersection of the other two lines.

Page 147 - A sidereal day is the interval between two successive transits of the vernal equinox over the same meridian. It is 3...

Page 398 - All buoys along the coast, or in bays, harbors, sounds, or channels, shall be colored and numbered, so that passing up the coast or sound, or entering the bay, harbor, or channel, red buoys with even numbers shall be passed on the starboard hand, black buoys with uneven numbers on the port hand, and buoys with red and black stripes on either hand. Buoys in channel-ways shall be colored with alternate white and black perpendicular stripes.

Page 280 - to be applied to the approximate altitude for the decrease of gravity on a vertical acting on the density of the mercurial column. It is always additive.

Page 336 - BŁ, intersecting at d; through d draw a line directed to C. Then set up at C, and assuming the point c on the line dC, at an estimated distance from d, and putting the table in a position parallel to that which is occupied at D, by means of...

Page 279 - Z = the difference of level between the two barometers ; L = the mean latitude between the two stations ; H= the height of the barometer at the upper station reduced to the temperature of the barometer at the lower station ; or, H= h...