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Knight's Mechanical Encyclopedia (ed. Knight) 1 1 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
and cut in a particular direction of the grain. Its edges are attached to the framing leaving its middle free to vibrate under the impulse received from the strings. It is supported by bars glued on to its back; but if these are made sufficiently strong to resist the tension of the strings, it is so stiffened as to prevent the requisite vibration; if otherwise, it is gradually forced out of shape so that its surface becomes curved, impairing the tone of the instrument. To remedy this, Mr. Dreaper of Liverpool applied hollow chambers to the back of the sounding board, adjusted to any desired pressure by screws. Piano-Forte actions. M. Pape, for this purpose, placed the sounding-board at the lower side of a frame to the upper part of which the strings are attached, so that their effect should be to extend rather than compress the sound-board. This arrangement also admits of its being made of larger size, so as to increase the resonance. The pitch of a note depends on the