A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams (1829)
Curtis, Thomas, fl. 1820 · London : Thomas Tegg · leaf 160
, drawn roundone or more points. It is common also, in va-rious parts of this stone, to find very beautifuldelineations of trees, mosses, sea plants, and thelike, so elegantly expressed, that many have er-roneously taken them for real plants includedin the substance of the stone; whence the name.… … DEN 150 DEN consists of a semicircle A, divided into twoquadrants, and graduated from the middle;upon the diameter B there hangs a plummet Lfor fixing the instrument in a vertical position;there is also a chord D parallel to the diameter,and a radius E, passing at right angles throughthe diameter…
Encyclopedias and dictionaries · Aeronautics
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