This is best achieved using finely ground coal, as bulk samples are quite porous.
2.
The county's topography also features many " strip cut " lakes, lakes left behind following above-ground coal mining.
3.
White phosphorus could then be made by heating the precipitated phosphates, mixed with ground coal or charcoal in an iron pot, and distilling off phosphorus vapour in a retort.
4.
There were engineering works at Milkwall belonging in 1889 to Tom Morgan which continued casting metals after World War I . A colour ( pigment ) factory was started at Milkwall in 1926 & ndash; it employed 7 people in 1965, when in addition to processing oxides mined elsewhere it ground coal for use in the paper and fibreboard industries and in drills.
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