The pneumatic player, the regulation and repair of some modern types . ns than those employedin the sixty-five. The rolls being exactly the samewidth, this compression was unavoidable. In many players, accurate tracking is obtainedby hand power, a milled thumbscrew, or a lever, inthe spool box, moving the roll to right or left asdesired. But this constant supervision considerablydetracting from the pleasure of the operator, theautomatic device was not long in making its ap-pearance. If we examine the perforations of a full compassroll and compare them with the tracker ducts, it willbe noticed
The pneumatic player, the regulation and repair of some modern types . ns than those employedin the sixty-five. The rolls being exactly the samewidth, this compression was unavoidable. In many players, accurate tracking is obtainedby hand power, a milled thumbscrew, or a lever, inthe spool box, moving the roll to right or left asdesired. But this constant supervision considerablydetracting from the pleasure of the operator, theautomatic device was not long in making its ap-pearance. If we examine the perforations of a full compassroll and compare them with the tracker ducts, it willbe noticed that the latter are unmistakably widerthan the former. This allows a slight deviation ofthe roll before two ducts are uncovered by the oneperforation, producing that deplorable discord sowell known to owners of dusty and neglected instru-ments. Even before a discord is produced, however,the deviation of the roll cuts down the amount ofair power to the pouches and greatly affects the TRACKING DEVICES 57 Front Elevation. Fig. I. Side Elevation. From Tracker Inner Duct.
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Keywords: ., bookcentury1900, bookdecade1920, bookidpneumaticpla, bookyear1921
