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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...for in such arrangement they find special appropriation to serve as bearers to the sounding-board. It is objectionable to give the ribs as bearers special width, and therefore to lessen the proportion of thickness. It will suffice if the ribs are given a breadth and thickness of 2'5 cm.; the proportion in width for the longest ribs may hereby be increased to 3 cm.; the thickness, however, remains 2'5 cm. The ribbing divides the sounding-board into fields; and, through a correct relation of these fields to one another, the degree of goodness of the resonance is partially determined. The sounding-board is not alone given a certain stiffness by the ribbing, but its elasticity also stands in close connection with the same. The method of ribbing the sounding-board has not been supplanted by any other during all the time in which pianos have been built. Those pianoforte makers who have studied the history of the piano, and have observed the history of the sounding-board for years, will understand that it is useless to try to substitute other means for the ribs and thereby better the ability of resonance in the sounding-board. Let us select from among the old methods one which has of late been advertised as a new invention. Two boards are so glued together that their grain crosses either in an acute or right angle, and the four rims of the board glued are then pointed in a like manner as the ribs on the sounding-board. A certain stiffness of the sounding-board may be obtained by such a method; but surely it holds no special property for the elasticity of the board. A better method to construct sounding-boards without ribbing is found in so working a thick board that the same forms a continuous undulatory figure at its cross end. The sounding-board bridges are plac...

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