Thames
- Type:
- shipwreck, tugboat, USA
- Built:
- 1885, USA
- Specs:
- ( 55 ft )
- Sunk:
- autumn 1973; foundered - no casualties
- Depth:
- 100 ft
Glass is a hard substance, usually brittle and transparent, composed chiefly of silicates and an alkali fused at high temperature.
Composition and Properties of Glass
Most glass is a mixture of silica obtained from beds of fine sand or from pulverized sandstone; an alkali to lower the melting point, usually a form of soda or, for finer glass, potash; lime as a stabilizer; and cullet ( waste glass ) to assist in melting the mixture. The properties of glass are varied by adding other substances, commonly in the form of oxides, e.g., lead, for brilliance and weight; boron, for thermal and electrical resistance; barium, to increase the refractive index, as in optical glass; cerium, to absorb infrared rays; metallic oxides, to impart color; and manganese, for decolorizing.
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