J(35 toXIDE OF PHOSPHORUS, 



XXII. 



Bafy Method qf making the very comhvftible Oxide of Phflfphorus, 

 By Amicus. 



To Mr. NJCfJOLSQN. 

 Dear Sir, 



Dxide of phof- X OU know very well that phofphorus united to a much 

 pnprus. fmaller proportion oF oxigen than is requiiite to render it into 



the acid ftate, brings it into the condition of anllikide which 

 fets on fire fulphur, on jiift rubbing it againft a common match. 

 But the common method of oxidizing phofphorus for phofpho- 

 ric matches by fixing it in (he bottles with a hot iron, is trou- 

 blefome and wafleful. This oxidation, however, may be 

 <Effe£ted with great facility and economy by expoiing a larg^ 

 proportion, viz. a hundred grains of phofphorus in ajar contain- 

 ing half g pint meafure of oxy-muriatic acid^ in which cir- 

 cumftance the phofphorus will be melted and fume, but fcarcely 

 take fire. After cooling, it mutt be kept excluded from th^ 

 air, to prevent the inflammation from mere expofure. 



Dear Sir, Yours, 



AMICUS. 

 May2Sth, 1805. 



XXIII. 

 Defcription of an extremely fenfibh Micro-eledromet&r, By Mr^ 



MARECHAUX.f 



A piece of leaf iN a glafs cylinder, about an inch and half in diameter and 



ed7o as to^be"'^' ^^'® °'* ^'^ '"^'^^^^ ^'g^ ' ^ P'^*^^ °^ ^*^^^ ^^'''^'" »« 'ufpended from 

 moveable in a a fmall pair of nippers, capable of being lowered or elevate4 

 glaii cylinder. ^^ jj^g length of the leaf may require. The piece that carries 

 the nippers may likewife be moved horizontally, fo that the 

 leaf may be moved at pleafure nearer to or further from a 

 fphere of copper, which is one of the poles of the inflru? 

 jnent. 



* Tranflated from Von Mons's Journal de Chimie^ Vol. VI. p, 

 / 38, Abridged by Van Mons from Gilbert's Annalen der Phyfik, 



^ The 



