Piano

In the use of grand pianos, it has been found that the resonance and tone distributing qualities are better when the cover of the grand piano is opened. On the other hand, it has been found that when such cover is opened, the direction of sound produced by the strings when the keys have been actuated is more or less unidirectional, in that the sound rays are deflected laterally of the length of the grand piano. In consequence, When people sit at the front of the piano, as for instance the player and those immediately attendant the player, they do not obtain the full benefit of the Sounds, resonance and overtones of the piano.

(via original patent application)

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