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 248
upper extremities D and B of the iron sectorsby which tliey are drawn up and down alter-nately. These sectors give also an alternatemotion.up and down to the piston-rods, by meansof two other chains left white in the figure, inorder to distinguish them from the others: theseare fastened by their… … J^-if/. 4. -Fif/. S. [f I-iff.2.
Encyclopedias and dictionaries · Aeronautics
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