R. Jung', Heidelberg 1 . 



Fig. 20. 



48. Large Centrifuge, new design, 

 with 4 cylinders for hand or 

 engine power: in the latter case 

 a fly wheel mounted on tripod 

 stand is supplied with the ma- 

 chine. (Fig. 20.) 



44. Small centrifuge, new design, 

 for high speeds (4000 to 6000 

 revolutions per minute) with co- 

 vered gearing and guard placed 

 over the cylinders, of which 

 there are 2 or 4 (Fig. 21, guard 

 not shown). 



45. Helmholtz's model of the 

 mechanism of the auditory 

 organs (Fig. 22). 



Fig. 21. 



