## Professional Papers of the Corps of Engineers of the United States Army |

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### Common terms and phrases

&c.—Continued altitude angle aoimuth Apparent Mean axis barometer bushel chord chronographs chronometer circumpolar star collimation column convert cooefficient corresponding cos2 cubic cubic centimetre culmination declination deflection diff difference of longitude Differences of Latitude distance dm dp elongation English Equal Altitudes Equations to Equal Fahrenheit feet formula horizontal houroangle humidity I.—Reduction inches instrument interval IOOO IOOO IOOO Latitude and Departures—Continued length limb LogB longitude LXVI.—Field Magnetic Observations mean noon mean solar measured meridian metre middle wire mile OOOO oscillation parallax Peirce's Criterion plane Polaris Polyconic Polyconic Projection PPV OOO prime vertical probable error reduced refraction right ascension s-lar sextant sidereal sin2 Square Roots—Continued stations Table tangent telescope temperature thermometer toise transit velocity xo xo XXIV.—Squares and Square Yards zenithodistance ZooZ ZoZo

### Popular passages

Page 16 - Statutes the tables in the schedule hereto annexed shall be recognized in the construction of contracts, and in all legal proceedings, as establishing, in terms of the weights and measures now in use in the United States, the equivalents of the weights and measures expressed therein in terms of the metric system...

Page 27 - Multiply the double meridian distance of each course by its northing or southing. 2. Place all the plus products in one column, and all the minus products in another. 3. Add up each column separately and take their difference. This difference will be double the area of the land. In balancing the work, the error for each particular course is found by the proportion — As the sum of the courses, is to the error of latitude, (or departure,) so is each particular course, to its correction.

Page 186 - ... of solar time. The astronomical day begins at noon. In the civil or common method of reckoning, the day is supposed to commence at the preceding midnight.

Page 11 - The units of capacity measure are the gallon for liquid, and the bushel for dry measure. The gallon is a vessel containing 58372.2 grains (8.3389 pounds avoirdupois) of the standard pound of distilled water, at the temperature of maximum density of water, the vessel being weighed in air in which the barometer is 30 inches at 62° Fahrenheit.

Page 142 - The coefficient of refraction or the proportion of intercepted arc is determined from the observed zenith distances to two stations, the relative altitudes of which have been determined by the spiritlevel; or from reciprocal zenith distances, simultaneous or not, under the assumption that the mean of a number of observations taken under favorable conditions will eliminate the differences of refraction found to exist even at the same moment at two stations a few miles apart.

Page 25 - Solid content = area of each end, added to four times the middle area, and the sum multiplied by the length...

Page 186 - ... under any meridian other than that of the nautical almanac used will be found by allowing the proportion of this quantity due to the difference of longitude of the two places. If the mean solar day be taken equal to 24 mean solar hours, the sidereal day will be equal to 23...

Page 12 - Solid. — 1 cubic foot = 1728 cubic inches. 1 cubic yard = 27 cubic feet = 46656 cubic Inches. 1 reduced foot (board-measure) = 1 square foot X 1 inch thick = 144 cubic inches. 1 perch of masonry = 1 perch (16J feet) long X 1 foot high X 1} foot thick = 24.

Page 94 - In terms of the coordinates of rectangular axes referred to one of the points of the triangulation, the latitude and longitude of which are known, — y being the ordinate in the direction of the meridian, and x the ordinate perpendicular to it, — the...

Page 287 - T and r', and by the errors of the personal equations yet to be applied. Moreover, a greater number of determinations should be compared, in order to arrive at a just evaluation of the mean error. 228. Velocity of the galvanic current. — Recurring to the equations of p. 343, we find, by taking the difference...