Chapter XIV: Miscellaneous Products

Glass tubing--Gathering and drawing of ordinary tubes--
Special varieties of tube--Combustion tubes--Tubes
of vitreous silica--Varieties of vitreous silica--
Transparent, glass-like silica ware--Great cost of
production--Translucent “milky” silica ware produced
electrically--Great thermal endurance of vitreous
silica--Sensitiveness to chemical action of all basic
substances at high temperatures--Glass rod and fibre--
Glass wool--Quartz fibres--Glass beads--Artificial
gems--Use of very dense flint glass coloured to imitate
precious stones--Means of distinguishing imitations--
Precious stones produced by artificial means--Chilled
glass--Great strength and fragility of chilled glass--
Rupert’s drops--Manufacture of “tempered” glass by
Siemens--De La Bastie’s process--Massive glass, used
for house construction and paving blocks--Water-glass
(silicate of soda or potash), manufacture in tank
furnaces--Glass for lighthouse lenses and searchlight
mirrors--Production by casting glass in iron moulds--
Sizes and types of lenses and prisms produced _p._ 238

APPENDIX--Bibliography of Glass Manufacture _p._ 253

GLASS MANUFACTURE