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Knight's Mechanical Encyclopedia (ed. Knight) 5 3 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), G. (search)
h are represented to the spectators, who stand on a framework inside. The globe of Gottorp was 11 feet in diameter; that of Dr. Long was 18 feet in diameter. Mr. Wyld's, 1851-61, was 60 feet 4 inches in diameter. The concavity of each of these represented the terrestrial surface. Wyld's globe was lighted by openings duringWyld's globe was lighted by openings during the day and by gas at night. See globe. Geo-stat′ic arch. （Architecture.) A linear arch of a figure suited to sustain a pressure similar to that of the earth, which consists, in a given vertical plane, of a pair of conjugate pressures, one vertical and proportional to the depth below a given plane, horizontal or slopinger the designs of Tycho Brahe, and turned on its axis. Dr. Long's globe was 18 feet in diameter, and held thirty persons, who viewed it while it was in motion. Mr. Wyld erected in Leicester Square a globe 60 feet 4 inches in diameter. Its concavity represents the terrestrial surface. It was lighted by openings during the day a
Knight's Mechanical Encyclopedia (ed. Knight), M. (search)
on exceeding 1,760 feet, a rise of 1/3 of an inch on a surface 16 feet square (one inch to the mile) would not be readily seen. The insignificance of the elevations on the earth's crust, compared with the area of the surface, is not generally appreciated, and it is common in plotting profiles of routes as in modeling the superficies, to give the rises and elevations ten times their actual proportion. This is to render them more visible. The largest attempt at geographical modeling was by Mr. Wyld, in his globe erected in Leicester Square, London, 1851-53. (See globe.) The interior surface (for convenience of general view) was modeled to represent the chains of mountains, table-lands, river valleys and depressions. It was executed in sections, and castings therefrom were afterward associated on the interior of a vast shell, and painted. Models of towns and ancient buildings in wood, plaster, and cork have excited much attention and interest, and are common in museums. Mod′el-