ART OF GLASSMAKING. ^^ 



X. 



VaTious Observations respecting the Art of Glassmaldng, 

 with a View to explain some Phenomena, that occur in the 

 Fabrication of Glass, and point out the Application of 

 these to the obtaining of new Products ; by Mr. GuYTON- 

 MoRVEAU*. ' 



JL ME art of glassmaking, though one of the most ancient, Artof»lass- 

 since there are documefits that attest its having been pruc- 'taking empi- 

 tised by the Pheiiicians, was long, like most of the useful ' 

 arts, nothing more than a tradition of those processes, which 

 had most uniformly succeeded. Now, however, we feel the but ought not 

 necessity of combining with it those principles, the upplica- 't> continue so, 

 tion of which has successively unfolded the essential circum- 

 stances of the processes, increased and improved their pro- 

 ducts, and may yet aflbrd new views either of economy or 

 perfection. 



Such was the object Mr. Loysel proposed to himself in Writeii on it, 

 J79l,inthe Essay presented by him to the Academy of Sci- 

 ences; which, under that modest title, left far behind it the 

 works of Nery, Merret, Knnckel, Haudiquert, Blancourt, 

 and others, who had written on the subject. 



Still more recently the labours of Mr. d'Artiguesf have D'Artigues. 

 given us hopes of a treatise, that would embrace the whole 

 of this art, and place it on a footing with the present state of 

 our knowledge. 



The two papers, that Mr, d'Artigues has already commu- Facts noticed 

 nicated to the class, have called my attention to some facts, ^f the author. 

 that I had noted down ; and which appear to me sufficiently 

 connected with the most important phenomena in the pro- 

 cesses of this art, not to be consigned to oblivion.. Of these 

 I shall proceed to give a succinct account, with such reflec- 

 tions as may tend to elucidate their theory, > 



The chief subjects of these observations will be : 



1. The separation of glass of different densities by eliqua- Classification 

 tion : of these. 



* Aiin, d,e Chim.vol. LXXllI, p. 113. Read to the Institute, the 

 20ihof Jan.and 5th of Feb. 1810. 

 t See Journal, vol. X, p. p. 58, 89. 



2. The 



