Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 560
PIANOFORTE. 537 … frame of the upright piano, Fig. 3373 showing the strings in place. Compression-screws press thesounding-board against the metal frame, and the latter rests directly upon the board and descends atcertain points between the braces of the wooden case ; here the compression-screws bring to bear…
Mechanical engineering -- Dictionaries
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