of Electrification 1 9 1 



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degree of electrification which made C separate \ divisions made D 

 separate j f divisions. 



I then put the wires into the electrometer D, and put the larger of the 

 two vials in the place of E, and electrified E and consequently the rod CD 



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and the two electrometers till D separated \ divisions. 



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The wire by which E was electrified was then immediately taken away 

 and a communication made between E and F, so that the redundant fluid 

 in E and CD and the electrometers was communicated to F. 



It was found that the electrometer C then separated \ ~ * divisions. 



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The experiment was then repeated in the same manner, except that 

 the smaller vial was placed at E. It was found that if E was electrified 



till D separated j divisions, then on making a communication between 



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E and F, C separated < * divisions. 

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391] From hence we may conclude that if the vials had been exactly 

 equal and E had been electrified till D separated ] ^ divisions, then on 



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making a communication between E and F, C would have separated 



t divisions. 

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But it appears from the first mentioned part of the experiment, that 



the same degree of electrification which makes C separate \ ' f divisions 



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is sufficient to make D without the wires separate \ divisions. From 



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whence it appears that if the jars are exactly equal, and one of them is 

 electrified till the electrometer D with the wires separates j divisions, 



and its electricity is then communicated to the other vial, the electricity 

 will be of that degree of strength which is necessary to make the same 



electrometer without the wires separate ] . divisions, that is, very 



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nearly the same as before, or as it did with the wire before the com- 

 munication of the electricity. 



But if the vials are equal, the quantity of redundant fluid in the first 

 vial, after its electricity is communicated to the second, will be very little 

 more than half of what it was before the communication, for the quantity 

 of redundant fluid in the rod DC and the electrometers is trifling in com- 



