VITREOUS ENAMELING 13 



Davidson, T. R. Cleaning of metal articles preparatory to the application. 



of a coating of enamel or the like. English Patent 16,554, July 18, 1913 



/. Soc. Chem. Ind., 33, 355. Concentrated sulfuric acid is used to car- 

 bonize the grease, and the pieces are then allowed to stand in water, 



where the diluted acid further cleans the articles, 

 de Haen, E., Chem. Fabrik List G. m. b. H. Enamel and glazes. German 



Patent 289,317, Jan. 14, 1913. C. A ., 10, 2792. Zinc sulfide is used as a 



substitute for the oxide. 

 Deleuil, S. L. Enameling metal plates. Fiench Patent 456,959, Apr. 22, 



1913. C.A.,9, 137. The plates, after immersion in the bath, are freed 



from excess by rapid turning. 

 Eyer, Ph. The assumed reduction of antimonic to antimonous compounds 



in enamels. GlasMtle, 43, 266, 327-8; C. A., 7, 3004. This does not 



take place. 

 Eyer, Ph. Design and equipment of an enameling plant. Keram. Rundschau, 



20, 433-5, 447-9, 538-40; 21, 24-7, 47-9; C. A., 7, 2102. 

 Eyer, Ph. The melting of enamels. ///. Ztg. Blechind., 1912, 640; C. A., 7, 



2459. 

 Eyer, Ph. Quartz and clay in enameling. Glashutle, 43, 662-3; C. A., 7, 



3647 . 

 Eyer, Ph. Scientific enameling. Glashutte, 42, 8-43, No. 12 (1912-1913); 



C. A., 7, 3004. An exhaustive treatise. 

 Frissell, N. E. Enameling process for cast iron sanitary ware. Foundry, 41, 



220-3; C. A, 7, 3209. 

 Goldschmidt, Th. Removing enamel and recovering the iron, etc. French 



Patent 418,971. First addition, May 5, 1913. /. Soc. Chem. Ind., 32, 



1072. 

 Havas, B. Manufacture of zirconium oxide. German Patent 262,009. 



May 5, 1913. C. A., 7, 3650. 



Hirsch, W. Furnace for enameling. German Patent 283,869, Feb. 1, 1913. 

 Honigmann, L. Enamel for sheet metal and other hard surfaces. French 



Patent, 465,574, Dec. 1, 1913. English Patent 28,398, Dec. 9, 1913. 



C. A., 8, 3495; /. Soc. Chem. Ind., 33, 355. The use of metallic silver. 

 Importance of powdered coal in enamel works. GlasshiiUe, 43, 1004-6; 



C. A., 8, 1194. The relative value of 3 varieties of charcoal and coal are 



discussed. 

 Influence of sulfur dioxide used as a disinfectant upon sheet steel enamel. 



Keram. Rundschau, 21, 380; C. A., 8, 224. Dry or water-laden sulfur 



dioxide is without effect upon perfect ware, but on ware exhibiting crazing 



defects, yellow spots are formed in the defective spots of the enamel. 



If the ware itself is wet, however, the sulfur dioxide fumes exert vigorous 



effect, due to sulfuric acid formation. 

 Kentonwski, L. A muffle furnace for enameling large cast iron kettles. 



Stahl u. Eisen, 32, 2179-80; C. A., 7, 2102. 

 Krause, H. Enamels. Electrochem. Z., 20, 113-6, 143-5, 176-9; C. A., 8, 



805. Historical and descriptive article. 



