ELECTRICAL PROPERTIES OF SILK. 1? 



rks at the place where it was separated from the 

 other, as did also the last one with the conductor ; 

 and all of them were negatively electrified. If 

 they were all taken from the plate together, they 

 cohered in one mass, which was negatively electri- 

 fied on both sides. If they were laid upon the 

 rough conductor, and then separated singly, begin- 

 ning with the lowermost, sparks appeared as before, 

 put all the ribands were electrified positively, 

 except the uppermost. If they received the friction 

 upon the rough conductor, and were all taken up 

 at once, all the intermediate ribands acquired the 

 electricity, either of the highest or lowest, according 

 as the separation was begun with the highest or 

 the lowest. If two ribands were separated from 

 the bundle at the same time, they clung together, 

 and in that state showed no sign of electricity, as 

 one of them alone would have done. When they 

 were separated, the outermost one had acquired 

 an electricity opposite to that of the bundle, but 

 much weaker. 



A number of ribands were placed upon a plate 

 of metal, to which electricity was communicated 

 by means of a glass globe, and a pointed conductor 

 held to the other side of the ribands. The conse- 

 quence was, that all of them became possessed of 

 the electricity opposite to that of the plate, or of 

 the same, according as they were taken off; except 



