ON THE COMBINATIONS OF OXIGEV. 2l3 



the plate caused its longest discharge to the electrometer, 

 which was at the distance of one inch and three eighths, and 

 fused one inch of wire, but with less violence than in the last 

 experiment. 



Exp. 25. The outside paper ring was scraped off, and Exp. 25. 

 the jar still preserved the same charging capacity, as when 

 both were on. 



The above experiments are sufficient to prove, that paper General con- 

 rings pasted on to electrical jars not only prevent them from •^""''^"^' 

 exploding to the outside coating before they have received 

 their highest charge, but that they likewise increase their 

 charging capacity; and that one ring pasted on in the inside 

 only is sufficient, if it is one inch broad ; one half of the 

 breadth must be pasted upon the coating, and the other 

 upon the uncoated part. 



Farther experiments and observations, setting forth the 

 advantages that electricians may obtain from the above dis- 

 covery, with an account of some experiments done with a 

 view to prevent the jars from being perforated by high 

 charges, without increasing their thickness, wherein I am. 

 in hopes I sjiall succeed, will be the subject of a future 

 paper. 



VII. 



On the Combinations ofOxigen, % Marshall Hall, £5^. 

 F. R- M. S. E. In a Letter from the Author^ 



To Mr. NICHOLSON, 

 SIR, 



JL HE utility and excellence of axioms in science are too Axioms of 

 well known to those, who are earnestly engaged in its pro- S^'J^J^^J® '^ 

 secution, to require to be expatiated on. The few observa- 

 tions on the combinations of oxigen, which I take the liberty 

 of transmitting ta you, do not perhaps deserve the dignified 

 name of axioms ; but where coincidences are so general and 

 striking, we are led, perhaps too soon indeed, to believe 

 them universal, If however I shall point out what generally 



takers 



