Excerpt from Illustrated Catalogue of Steinway and Sons' PianosGentlemen: I can only congratulate you on the great improvement you have achieved by the introduction of your Duplex Scale into your piano-fortes. I have repeatedly and carefully studied the effects of the Duplex Scale just applied to my Steinway Grand Piano. And find the improvement most surprising and favorable, especially in the upper notes, for Splendid as my Grand Piano was before, the Duplex Scale has rendered its tone even more liquid, singing, and harmonious. I deem this improvement very happy in its results and being based upon scientific principles, capable of still greater development. Yours, very truly, H. Helmholtz.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.