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
in a hollow canal cut through the greatest part ottheir length. To this centre on each side is af-fixed a sliding piece, A, fig. 1, of a small length,with a fine line drawn on it serving as an index,to be set against other lines or divisions placedupon the compasses on both sides. These linesare,…
Encyclopedias and dictionaries · Aeronautics
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