72 On Electricity. 



sponge in the liquor, then dipping it in a little fine clean 



sand, and afterwards rubbing the wainscot therewith. 



Various experiments were made by Mrs. Morris in the 

 presence of a committee, at the society's house: the whole 

 process was performed before them upon fine and coarse 

 goods of different fabrics, and to their satisfaction. 



A 



XTII. On Electricity, 



To the Editor of the Philosophical Magazine. 



sin, 

 few evenings ago, when making some electrical ex- 

 periments, the following circumstance occurred, which was 

 quite unexpected, and which, I believe, has been very little 

 noticed hitherto. The phenomenon related by your cor- 

 respondent C. R. in your numbers for March 1805 and last 

 March, appears to be occasioned by the same cause. 



Happening to take two cylindrical pieces of wood, covered 

 with tin-foil, in my hands to discharge a loaded jar — on re- 

 moving these cylinders from each other (after the discharge 

 had been made) there was a small adhesion between them, 

 which I at first thought might be occasioned by a piece of 

 wax, but this was not the case; this adhesion I perceived 

 several times that evening, and also since, and sometimes 

 there was a small protuberance raised at the part where the 

 cylinders touched ; I also perceived the same sort of adhesion 

 between one of the cylinders and the coating, The pheno- 

 menon alluded to above, of your correspondent's, is that of 

 a shilling, or other piece of metal, which being placed 

 between the knob cf the discharger and the coating of ajar 

 adhered to the side of the jar after the discharge : this experi- 

 ment I tried and succeeded in ; a shilling adhered tor lonser 

 than twelve hours to the coating, and perhaps if it had not 

 been taken off might have kept on for days. Whether this 

 aclhcrion and that before mentioned betwixt the cylinders 

 were caused by a fusion of the tin-foil or not, I will not 

 take on me to determine. I once conjectured that this effect 



v a-; 



