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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.
Utangiye
Unknown
Amabwiriza
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.
Ibikoresho by'iyi ntambwe:
Umusenyi1 Isle of Wight sandIbikoresho bikenewe:
Amazi
Ikibindi cy'imbaho2
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.
Ibikoresho bikenewe:
Itanura rya reveribera3
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.
Ibikoresho bikenewe:
Akayunguruzo Gafite Urukoma RutoIbikoresho bikenewe
4- Umwanya
- Umwanya
- Umwanya
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