 | Olinthus Gilbert Gregory - 1802 - 590 pages
...levelling, tends greatly to confirm the justice of this inference ; for, if the earth be a sphere, two or more places are on a true level when they are 'equally distant from its centre ; but the line of sight, or apparent level, will be a tangent to its surface, and consequently... | |
 | Jacques Ozanam - Scientific recreations - 1803 - 660 pages
...level, we think it necessary to add a few observations on the subject. Two or more places are said to be on a true level, when they are equally distant from the centre of the earth. One place also is higher than another, or out of level with it, when it is farther from the centre... | |
 | James Mitchell - Mathematics - 1823 - 666 pages
...rcorasaes, conducting \vaer, &c. Two or more places are on a true evel when they are equally disant froiu the centre of the earth* Also one place is higher than another, or out of level with it, when it ia farther from the centre of the earth; and a line equally distant from that centre in all its points,... | |
 | William Grier - Mechanical engineering - 1832 - 366 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 in the same straight line, but the true level gives the line which... | |
 | John Farrar - Trigonometry - 1833 - 276 pages
...the case refers itself to art. 137,4. 883034A Levelling. 140. Two or more points are said to be on a level when they are equally distant from the centre of the earth f, or from the surface of a tranquil fluid, supposed to be situated immediately above or below them.... | |
 | John Farrar - Trigonometry - 1833 - 274 pages
...triangle, and the case refers itself to art. 137,4. Levelling. 140. Two or more points are said to be on a level when they are equally distant from the centre of the earth f, or from the surface of a tranquil ffuid, supposed to be situated immediately above or below them.... | |
 | Frederick Walter Simms - Astronomical instruments - 1834 - 124 pages
...horizon at one or more stations, to determine the height or depth of one place with respect to another. Two or more places are on a true level, when they...earth. Also, one place is higher than another, or above the level of it, when it is further from the centre of the earth ; and a line equally distant... | |
 | Luke Hebert - Industrial arts - 1835 - 938 pages
...conducting water, &c. It is necessary to premise that two or more places are, strictly speaking, on a level, when they are equally distant from the centre of the earth ; and a line, of which all its constituent points are equally distant from that centre, is called the... | |
 | William Grier - Mechanical engineering - 1836 - 384 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 in the same straight line, but the true level gives the line which... | |
 | William Grier - Mechanical engineering - 1842 - 320 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 in the same straight line, but the true level gives the line which... | |
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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... 
