The pneumatic player, the regulation and repair of some modern types . Fig. I. Pistonola Valves. lEnlarged) A state of vacuum of light tensionis produced in the chamber A ; ofheavier tension in the chamber roll admits air into the tube C,and the primary valve D is drawnup, lifting the coned pin E, destroy-ing the vacuum in the air channelbeneath the cone. The secondaryvalve F is then drawn up by theheavier vacuum, thrusting up theball valve G. This ball shuts offopen air and brings the cylinder Hunder powerful vacuum, drawing upthe piston J, which lifts the pianolever by means of the loo
The pneumatic player, the regulation and repair of some modern types . Fig. I. Pistonola Valves. lEnlarged) A state of vacuum of light tensionis produced in the chamber A ; ofheavier tension in the chamber roll admits air into the tube C,and the primary valve D is drawnup, lifting the coned pin E, destroy-ing the vacuum in the air channelbeneath the cone. The secondaryvalve F is then drawn up by theheavier vacuum, thrusting up theball valve G. This ball shuts offopen air and brings the cylinder Hunder powerful vacuum, drawing upthe piston J, which lifts the pianolever by means of the loop K. When the roll covers the trackerduct, the air pulse beneath theprimary D is immediately absorbedround the sides of the valve, whichdrops into the original position, clos-ing the air channel to tne secondary. The countersunk holes L, be-neath each pinpoint, are connectedone with another by grooves, andalso to the heavy vacuum chamberB, and on the conclusion of a notethey absorb any air in the channels,thereby ensuring a most effectiverepetition. THE PISTONOLA 47. EHehvy Ifnsion Fig. II. Pistonola Accentor. The ball governor 1 is held in equilibrium by the spring 2and the diaphragm 3, the latter being drawn down againstthe spring by the vacuum. A primary and secondary(similar to Fig. I., without the piston) exhausts the airchamber 4, and permits the spring to thrust up the ball,increasing the power through the port 5. at Fig. II., I will endeavour to make it clear. Theball governor is there at normal wind, ample powerbeing obtained through the port 5; but on pressingthe treble or bass button air rushes to the primaryand secondary (not shown in the sketch), exhauststhe accenting port, and allows the spring (2) topush up the ball governor and obtain a greatlyincreased air power through the port (5). Similarlythe marginal perforations in the accented music 48 THE PNEUMATIC PLAYER roll carry out the same scheme. The tension spring(2) can be adjusted by its screw, to increase orr
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Keywords: ., bookcentury1900, bookdecade1920, bookidpneumaticpla, bookyear1921
