Application of the Bloii'-pipe. ^9^ 



<1ifcharged into that compartment of the caflc under which 

 the mouth of the fyphon fliould be placed, and if the cock 

 at Y fhould be clofed, this compartment alone would become 

 filled; but if this cock (hould be open, the air would divide 

 itfelf equally between both compartments. It muft be ob- 

 vious, that while one matrafs and fyphon are employed ia 

 filling one compartment with one fpecies of air, the bellows, 

 or another matrafs and fyphon filled with dift'erent fubltances, 

 may be employed in filling the other compartment with an- 

 other fpecies of air; and thus the oxygen, and hydrogea 

 gafes or oxvgen gas, and atmofpheric air, may at the fame 

 time be confined in the fame vefi'el without their mixing with 

 each other. 



Thofe who defire to experiment largely with oxygen gas 

 will find it advantatreous to make ufe of a cafii iron matrafs, 

 with a (hort and large neck narrowing inwards, and about 

 fifteen inches of a gun barrel. The neck of the matrafs being 

 made large and fliort^ it will not only be eafily filled, but will 

 be readily freed from any caput mortuum wjiich may be left 

 in it. The gun-barrel mull be ground to fit the neck of the 

 matrafs. 



The fvphon for conveying the gas into the caflc may be 

 fitted to the gun- barrel with a cork. 



The phikifophical world has been for fome time acquainted 

 with the intenfc heat produced by combuftion fujiported wiih 

 oxygen gas. Bv means of the hydroltatic blow-pipe, every 

 artill may, with little trouble and expenfe, avail himfelf of 

 the inte\)fo heat produced by this combufiioii *. 



Probably there are not at prefent many operations in the 

 arts which require greater heat than may be produced by the 

 ordinary incans ; but it is certain that the kncnviedge of a 

 procefs cannot precede an acquaintance with the heat necef- 

 fary to effect it; and this rnoft inlenfe fire being jilaced 

 within the reach of the artift, it is highly probable that cafes 

 may be dii'covcred in which it may ue applied with conve- 

 nience and utility. 



The moft convenient way of making ufe of oxygen gas for 

 fmall operations, is to fupply one of the compartments of the 

 hydroHatic blow-pipe with that gas; to retain the gas thus 

 confined for thofe moments when the greateft heat is re- 

 quired; and, by means of the other compartment, to make 



* In a former page I mentioned the gafomcter of Lavoiilcr as being 

 too complicated for ordinary application to the Cupply of oxygen gis. I 

 (hould al'o tiavc noticed the apparuus of S:ullcr ami the g.ifometer of 

 8eguin ; but, if I am not niiflakcii, iljcfe, altiioDjrh very iin^.uioui in^cn- 

 tiQDS, are liiiblc to the fame oijjc£iion. 



9 ufe 



