Alkali-barium Silicate Glass
Without this type of glass, watching TV would be very dangerous. A television produces X-rays that must be absorbed, otherwise they could in the long run cause health problems. The X-rays are absorbed by glass with minimum amounts of heavy oxides (lead, barium or strontium). Lead glass is commonly used for the funnel and neck of the TV tube, while glass containing barium is used for the screen.
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Many glass making terms have entered the language: 'Coddswallop': Hiram Codd invented the marble stoppered 'pop' bottle in the 1870s, and millions of the bottles were made, particularly in South Yorkshire. 'Wallop' was the name given to the cheap beer of the day, and beer drinkers dubbed the contents of the codd bottle 'a load of coddswallop'.