1046 TRANSACTIONS OF THE AilERICAN INSTITUTE. 



2. Sheet glass. 



3. Brown plate, silvered or unsilvered. 



4. Colored sheet, pot metal or flashed. 



B. Painted and other kinds of ornamental window glass. 



C. Cast plate glass. 

 a. Rongh plate. 

 h. Pressed plate. 

 c. Rolled plate. 



D. Bottle glass. 



1. Ordinary bottle glass. 



2. Moulded bottle glass. 



3. Medicinal bottles. 



4. Tubing. 



E. Glass for chemical and philosophical purposes, retorts, reser- 

 voirs, large water pipes, etc., etc. 



F. FHnt, or crystal glass, with or without lead ; white, colored, 

 ornamented, for table ware, etc. 



1. Blown. 



2. Moulded and pressed. 



3. Cut and engraved. 



4. Reticulated and sj)un with a variety of colors, incrusted, 

 flashed, enameled of all colors, opalescent, imitation of alabaster, 

 gilt, gelatinized, silvered. 



5. Glass mosaic, miliflori, and aventurine and Venetian glass 

 weights. 



6. Beads, and imitation of pearls, etc. 



7. Chandeliers, candlesticks, and lamp apparatus. 



G. Optical glass, flint and crown. 



1. Rough disks of flint and crown, to make lenses for telescopes, 

 microscopes, stereoscopes, spcctroscoi^es, daguerreotype and calotype 

 apparatus. 



2. Flint and crown, blown, or cast in plates for the optician. 



3. Fine glass for microscopes. 



4. Refractive apparatus, prismatic lenses for lighthouses. 



The above classification was made at tlie London universal exhi- 

 bition of 1851. Another classification is made in the following kinds, 

 according to their constituent materials ; 



1. The soluble glass, silicate of soda or potash, or both alkalies 

 combined with silica. 



2. Bohemian glass, a silicate of potash and lime. 



