Later devices utilized an electric vacuum motor. An early Aeolian Pianola 65-noteĮarly devices created vacuum through the efforts of an individual pumping the atmosphere out of a large pair of bellows. This same methodology was applied to percussive instruments, such as orchestra bells or drums, and to organ pipes as well, creating band organs. This collapsed the bellows, which had a rod connected to it, and the rod pushed either downwards onto a piano key, or on later devices, upwards directly onto a part of the piano action that pushed the hammer into the string. These devices utilized a vacuum system that created suction so that when a hole on the roll passed over a vent on the tracker bar (the long brass or nickel-plated piece with holes in it), it interrupted the vacuum on a valve connected to that vent, rerouting that vacuum to a small pneumatic bellows. They were the first to use the familiar paper roll with perforations in it. Modern player piano mechanisms are not too much different in theory from the first pneumatic devices of the late nineteenth century. In addition, the size of both media was static, which limited the amount of music that could be reproduced without changing to another cylinder or disk. Not only that, but the continued cranking of the organ, a action which looked as if one grinding meat, thus the well-known colloquialism, required a good deal of stamina even for a short time. Both devices were at a disadvantage because it was a fairly tedious process to create either a cylinder or a music disk, and mass production would have been difficult if not impractical. But the cylinders or disks were also used for large organs at that time, with the eventual goal of applying them to other keyboard instruments.
The early instruments of this type evolved into the hand cranked barrel organ, which is still the instrument of choice for street corner organ grinders.
These contraptions used cylinders or disks with pins on them to open valves that sounded organ pipes, similar to the mechanical method utilized in a music box where the pins pluck on tuned tines. The first successful attempts A German hand-cranked barrel organ.Īt creating such a device were made in the early eighteenth century.