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 309
s got back the whole length of 278 COMPASSES. the branch. It is the same with the other dove-tail. The distance between the two sliding dove-tails is the distance between the two foci of theellipsis; so that, by changing that distance, theellipsis will be rounder or slenderer. Under theends of the… … Compasses, Lapidarys, are a piece of woodin form of the shaft of a plane, cleft at top, asfar as half its length; with this they measurethe angles, &c. of jewels and precious stones, asthey cut them. There is in the cleft a little brassrule, fastened at one end by a pin ; but so that itmay be…
Encyclopedias and dictionaries · Aeronautics
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