422 



Sir W. Thomson. 



[Apr. 



the drum, and serves as one of the bearings ; the other bearing is 

 rotating pivot fixed to the outside of the other end of the drum. 

 The accompanying sections, drawn to a scale of three-fourths full 

 size, explain the arrangement sufficiently. A magnetic needle out- 

 side, deflected by the fixed magnet when the drum is at rest, shows 

 a great diminution of the deflection when the drum is set to rotate. 



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