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 344
: these keys lie over the horizontal bar ofwood W, in which are stuck a usual number ofwire pinsr, z, on which keys are fixed; and thekeys move up and down on the ear, as on a cen-tre. There is another bar, against which thekeys fall when put down, and which is heremarked 3 : on this also are… … ORGAN. 521 we shall now describe. First s, t, s, are the key-rollers, moving on the pivots /, t: these rollerslie horizontally, one above another, and are ofsuch a length as to reach from the valve to thekey; a, a, a, are arras or levers fixed to the keyrollers; w, w, the valve wires fixed to the…
Encyclopedias and dictionaries · Aeronautics
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