 | Henry James Castle - Surveying - 1847 - 454 pages
...railways ; every professional man must have experienced this himself.LEVELLIN G. |Jrtrt ti)e t£0urtl). CHAP. I. LEVELLING is the art of representing the...the purpose of levelling, is called a spirit level. SPIRIT LEVELS. Description of the usual kinds. The spirit level is merely one portion of almost every... | |
 | Anthony Nesbit - Plane trigonometry - 1847 - 492 pages
...LEVELLING. LEVELLING is the art of representing the inequalities of the upper boundary of any section of the earth's surface, and of determining the relative heights of any number of points in that boundary, above or below a line equidistant, at every point, from the earth's centre. This... | |
 | Anthony Nesbit - 1870 - 578 pages
...LEVELLING. LEVELLING is the art of representing the inequalities of the upper boundary of any section of the earth's surface, and of determining the relative heights of any number of points in that boundary, above or below a line equidistant, at every point, from the earth's centre. This... | |
 | California Academy of Sciences - Science - 1876 - 448 pages
...navigable channels and water-basins. Contouring represents the inequalities of the earth's surface by determining the relative heights of .any number of...or below a line equidistant at every point from the earth's center. This line is what is understood by the term "a level-line," and is that which is assumed... | |
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LEVELLING is the art of representing the inequalities of the earth's surface, and of determining the relative heights of any number of points above or below a line, equidistant, at every point, from the centre of the earth. 