COMPARATIVE POWER9 OF ELECTRICAL MACHINES. 



£23 



No higher charge was employed; for this could not have 

 been obtained without breathing into the jar, which might 

 have occasioned irregular results. 



A battery of 15 jars exposing 17 square feet of coated 

 surface was next employed, and the following results were 

 obtained. 



Farther exp» 

 riment*. 



Plate Machine, 



Slider on the JTurns of the winch 

 arm of the elec- 

 trometer at 



10 grains 

 15 grains 



required for the 

 discharge. 



75 

 102 



Cylinder, 



Slider on the 

 arm of the elec- 

 trometer at 



10 grains 

 15 grains 



Turns of the whetl 



required for the 



discharge. 



63 



70 



The increased 

 power not ex- 

 actly propor- 

 tioned to the 

 velocity of the 

 motion. 



The battery was next charged by the cylinder, turned 

 with a simple winch; the slider on the arm of the electro- 

 meter remained at 15 grains, the discharge took place in 

 246 turns. Hence it appears, the advantage gained by the 

 cylinder with its multiplying wheels is not in the exact 

 proportion of the increased number of turns, the intensity 

 being somewhat diminished by the rapidity of the motion : 

 for 70 X 4 r: 286, and only 246 were required, a deficiency 

 of nearly |th. 



Multiplying wheels were now applied to the plate ma- Plate maeha* 

 chine, the ratio of increase was as follows : 



Battery of 15 jars. 

 Slider on the arm of electrometer at 10 grains 



Turned by a sim- 

 ple winch effect- 

 ed the charge in 



75 turns. 



Turned by multi- 

 plying wheel: 

 2 revolutions to 



42 turns. 



By ditto, 

 3 revolutions to 1 



28 turns. 



By ditto, 

 4 revolutions to 1. 



19 turns. 

 These 



