 | Francis Henney Smith - Arithmetic - 1845 - 710 pages
...8. LENGTHS ofcmves.—See Rectification. LENS.— See Refraction. LEVELLING. Two or more places are on a true level, when they are equally distant from the centre of the earth ; and a line equally distant from that centre in all its points, is called the line of true level.... | |
 | Sir J. Butler Williams - Geodesy - 1846 - 368 pages
...assign the difference of altitude between one place and another. "Two or more places are on the same level, when they are equally distant from the centre of the earth. Also, one place is higher than another, or above the level of it, when it is further from the centre... | |
 | William Smyth - Navigation - 1855 - 234 pages
...earth's surface. The mode of doing this we proceed next to explain. 162. Two points are said to be on a level when they are equally distant from the centre of the earth. from the surface of a tranquil fluid ; supposed to be situated immediately above or below them. A level... | |
 | William Grier - Mechanical engineering - 1861 - 316 pages
...what is called the apparent level, which however is not the true level. Two stations are on the same true level when they are equally distant from the centre of the earth. The apparent level gives the objects iu the same straight line, but the true level gives the line which... | |
 | Gerardus Beekman Docharty - Geometry - 1867 - 474 pages
...division line S. 37° 39' W. (Distance 20.35 ch. LEVELING. (20.) Two or more points are said to be on a level when they are equally distant from the centre of the earth or from the surface of a tranquil fluid. A level sui'face, therefore, is one that is every where perpendicular... | |
 | William Hamilton Richards - Military topography - 1883 - 256 pages
...point C, being perpendicular to the earth's semidiameter. Two or more places are said to be on the same level when they are equally distant from the centre of the earth, as DO C. Hence the true level is not a plane, but a cnrve concentric with the general figure of the... | |
 | William Hamilton Richards - Cartography - 1888 - 276 pages
...bsing perpendicular to the earth's semiFio. 85. diameter. Two or more places are said to be on the same true level when they are equally distant from the centre of the earth, as D 0 C. Hence the true level is not a plane, but a curve concentric with the general figure of the... | |
 | Arthur Thomas Walmisley - Leveling - 1900 - 354 pages
...the eighteenth century upon mathematical subjects, states " that two or more places are on the same level when they are equally distant from the centre of the earth. Also one place is higher than another, or above the level of it, when it is further from the centre... | |
 | Anthony Nesbit - Measurement - 1859 - 482 pages
...visible horizon being a tangent, or at right angles to the line of direction. Two or more places are on a true level when they are equally distant from the centre of the earth; also, one place is higher than another, or out of level with it, when it is farther from the centre... | |
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One place also is higher than another, or out of level with it, when it is farther from the centre of the earth ; and a line equally distant from that centre in all its parts, is called the line of true levei. 
