534 COMPARATIVE POWERS OF ELECTRICAL MACHINE^ 



tJtility of this These experiments sufficiently prove the utility and im* 

 improvement portance of Mr# Cuthberlsoh's improvement of the plate 

 machine, by the application of multiplying wheels; for 

 when allowance' is made for Some defects in the machinery 

 we employed, (which had only been mounted in a rough 

 manner for trial), it will be found, that the charging power 

 increased so nearly in proportion to the number of revolu- 

 tions; as to exhibit in uO instance a deficiency of more than 

 •yth: atfd in the last experiment with the plate machine, the 

 diminution is only yV tn » although the original charging 

 power is quadrupled. Thus in the* three experiments in 

 which the motion of the plate was accelerated; 42X2 — 

 84 ; 28 X 3 — 84 ; and 19 X 4 — 76. 1 he numbers required 

 hy the simple winch was 75, and 75 is to 84 nearly as 7 

 to 8. 

 Principle ca pa- As there is no reason to suppose, that our experiments 



ble of being have reached the limit, to which this charging power may 

 carried farther, , .j . . „ . ' i , . ^ , b ." r * 



be increased ; it is fair to conclude, that, by the proper ap- 

 plication of a moving power, the quantity of electricity 

 given out by any machine in a determinate time may be 

 doubled, trebled, quadrupled, or even increased six or ten- 

 and of great fold. The discovery ^of this principle is therefore of the 

 importance, highest importance, as it offers the most effectual and ready 

 means of obtaining a very considerable accumulation of the 

 electric fluid ; a circumstance of considerable interest in the 

 present state of electrical and chemical inquiry* 

 Comparative With respect to the comparative advantages of the dif- 

 advantages of ferent instruments, much might be said ; at present it may 

 suffice to state only those facts, which are of general utility. 

 When we first endeavoured to ascertain the power required 

 to put each machine in motion, it appeared, that the cylin- 

 der required 14lbs; and the plate only 8lbs. It was after- 

 ward found, that this disparity arose in part from an in* 

 equality in the levers, by which they were moved ; when 

 these were made equal, the difference was much less consi- 

 derable, lOlbs. were required for the cylinder* and 8lbs. for 

 the plate; and this difference in their friction will not Off 

 found more than commensurate to the difference in their 

 acting power, 



tw 



the two ma 

 chines. 



