2344. Bohemian Crown Glass

2344.    Bohemian Crown Glass. Pure silicious sand, 63 parts; potash, 22 parts; lime, 12 parts; oxide of manganese, 1 part.

2345. Nearly White Table Glass

2345.      Nearly White Table Glass. Take 20 pounds potashes, 11 pounds dry Glauber salts, 16 pounds soaper salt, 55 pounds sand, and 140 pounds cullet or broken glass of the same kind. Or: 100 parts sand, 235 kelp, 60 wood ashes, 11/3 manganese, 100 broken glass.

2346. White Table Glass

2346.    White Table Glass. Fuse together 40 pounds potashes, 11 chalk, 76 sand, J part manganese, 95 white cullet. Or: 50 parts purified potashes, 100 sand, 20 chalk, and 2 saltpetre.

2347. Crystal Glass

2347.  Crystal Glass. Take 60 parts purified potashes, 120 sand, 24 chalk, 2 saltpetre, 2 arsenious acid, 1/16 part manganese. Or: Purified pearlashes, 70 parts; 120 white sand; 10 saltpetre; 1/2 part arsenious acid; and 1/2 part manganese. Or: 67 parts sand, 23 puri fied pearlashes, 10 sifted slacked lime, 1/4 part manganese, 5 to 8 red lead.

2348. Clear Crystal Glass

2348.    Clear Crystal Glass. White sand, 15 parts; red lead, 10 parts; refined ashes, 4 parts; nitre, 1 part; arsenious acid and manganese, of each a very little.

2349. Vienna Plate Glass

2349.    Vienna Plate Glass. Sand, 100 parts; calcined sulphate of soda, 50 parts; time, 20 parts; charcoal, 23/4 parts.

2350. Plate Glass

2350.      Plate Glass. Pure sand, 40

It has been suggested that the oxide, or other salt of thallium, substituted for the lead, makes a paste of greater brilliancy and dispersive powers for optical purposes, and for imitation gems.

2351. French Plate Glass

2351. French Plate Glass. White quartz sand and cullet (old glass), of each 300 parts; dry carbonate of soda, 100 parts; slacked lime, 43 parts. Or: Pure sand, 72 parts; refined soda, 45 parts; quicklime, 48 parts; nitre, 21/2 parts; cullet (old glass), 45 parts.

2352. Table of Proportions of the Materials Used for Making Lead Glass, the Numbers Increasing with the duality

2352. Table of Proportions of the Materials Used for Making Lead Glass, the Numbers Increasing with the duality.