An analysis of plate glass / by J.S. Brazier.

  • Brazier, James S. (James Smith)
Date:
[1850?]
Catalogue details

Licence: Public Domain Mark

Credit: An analysis of plate glass / by J.S. Brazier. Source: Wellcome Collection.

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    III.—LONDON AND MANCHESTER PLATE GLASS. T. II. MEAN, Silicic acid 78*0357 77*7827 77*9092 Potash - - - 1*7453 1 7062 1*7257 Soda 12*4373 12*2822 12 3598 Lime - - - 4*7270 4*9816 4*8543 Manganese traces traces traces Sesquioxide of iron Alumina 3*5495 3*6502 3*5998 100*4948 100*4029 100*4488 A table is subjoined containing analyses of several varieties of plate glass, in order that the composition of the plate glass in this country may be compared with that manufactured abroad. The Venetian glass was analysed by M, Berthier, the Bohemian mirror glass by Peligot, and the French glasses by Dumas.* London London & Man- Venetian Bohemian French Plate British Thames Chester Plate Plate Glass. Plate Plate Plate Glass. Glass. No. 1. No. 2. Glass. Glass. Glass. Silicic acid 68*6 67*7 75*9 73*85 77*36 78*68 77*90 Potash - 6*9 21*0 6*50 3 01 1*34 1*72 Soda 8*1 ... 17*5 12*05 13 06 11*63 12*35 Lime 11-0 9*9 .3*8 5*60 5*31 6*09 4*85 Magnesia 2*1 • • ♦ ... ... ... Manganese 0*1 • • • • • • •«• ■ • • • • • trace Oxide of iron - 0*2 0*91 trace Alumina 1*2 i*4 2*8 3*50 traces 2*68 3*59 98*2 100*0 100*0 100.00 99*65 100*42 100*41 Plate glass is usually considered as a double silicate of lime and soda, or of lime and potash. The following atomic expressions repre¬ sent the ditFerent analyses contained in the above table ; the amount of potash contained in the English varieties of glass being very trifling, this oxide has been neglected altogether in the construction of their formulae. Venetian plate glass Bohemian mirror glass French plate glass. No. 1 French plate glass, No. 2 British plate glass London Thames plate glass London and Manchester plate 2 KO, 3 NaO, 5 CaO, 22 SiO., KO, CaO, 4 SiOg 4 NaO, CaO, 11 SiO^ KO, 3 NaO, 2 CaO, 14 SiO^ 2 NaO, CaO, 9 SiOg, 2 NaO, CaO, 8 SiO^ 2 NaO, CaO, 9 S.iO^ * Comp. Knapp’s Teclmology, Vol. II., p. 16.