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 84
eaf t of the key stops upon the bottomof the recess cut in the upper edge of the barrel.In this position the sliders are depressed, so thatthe notch made in each slider comes exactly op-posite the steel ring h b, and the barrel is atliberty to turn round all the sliders, being by thismeans…
Encyclopedias and dictionaries · Aeronautics
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