RECORDING CYLINDER. 



205 



be slipped off the axle for covering with paper and smoking the surface 

 of the latter. The axle runs in double ball bearings at its lower end. 

 2. The driving pulley D, with various speeds (grooves for the 

 driving cord), is carried on an axle which runs on ball bearings C, and 

 transmits its motion to the driving disc on the drum axle by means of 



FIG. 34. Cylinder, general stand and driving cord. 



a roller E. The bearings which support this axle are pivoted to an 

 upright on the drum stand, and an arm B actuates the rocker in such 

 a fashion as to start and stop the drum without arresting the move- 

 ment of the driving pulley. 



