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Quartz Sand: Washed and Burnt Glass Sand (Pellatt, 1849)
How an English flint-glass house made its sand fit for glass in 1849: Isle of Wight sand, low in iron, washed by hand in about eight waters to take out chalk and other impurities, dried or burnt in a heated arch called a calker, then sifted through a lawn sieve.
The washing takes away about one fifth of the sand's bulk.
Source: Apsley Pellatt, Curiosities of Glass Making (1849), pp. 35-36. Picture: the book's text.
Oqalayo
Unknown
Imiyalelo
1
1
Wash the sand
Wash the sand
Wash Isle of Wight sand by hand in about eight waters to cleanse it from chalk and other impurities. It loses about one fifth of its original bulk.
Izinto zokwakha zalesi sinyathelo:
Isihlabathi1 Isle of Wight sandAmathuluzi adingekayo:
Amanzi
Ubhavu wokhuni2
2
Dry or burn it in the calker
Dry or burn it in the calker
Pass the washed sand through a heated arch called a calker and dry it thoroughly, or burn it, at the operator's discretion.
Amathuluzi adingekayo:
Isithando Se-Reverberatory3
3
Sift through a lawn sieve
Sift through a lawn sieve
Sift the sand through a lawn sieve to separate the larger grains and pieces of coal or coke, and burn off the vegetable matter.
Amathuluzi adingekayo:
Isisefo Senetha EcolekileIzinto
1- 1 Isle of Wight sandIsibambeli
Amathuluzi Adingekayo
4- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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