GrirritH C.J. The subject matter of this alleged invention is
"improvements in or relating to note-sheets for player-pianos
and the like," that is, pneumatic sheets to be used on what are
commonly called "pianolas." The principle of the pianola, as I
understand it, is that for the mechanical pressure of the human
finger upon the keys of a piano is substituted pneumatic pressure
applied to the key desired to be struck. The manner in which
the particular notes are selected is by passing over a proper
apparatus a perforated sheet, so that the pressure is allowed to
pass through the perforations at the appropriate time so as to
depress the desired key. 'The duration of the depression to
which the duration of the vibration of the string corresponds
depends upon the length of the perforation - a longer perforation
resulting in a longer vibration. For instance, a semibreve would
be represented on the sheet by a long perforation and a semi-
quaver by @ correspondingly short perforation, and so on. When
that invention was first brought into operation, it was thought
by the inventors that each perforation should be of a length
corresponding exactly with what would be the result if the key
had been struck by the human finger. But it was discovered
Jater that this method produced what is called a staccato effect,
that is, a series of separate notes sharply separated from one
another without any connection between them, which was not