A Memoir On British Resources of Sands Suitable for Glass-Making ..
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The use of a greater velocity than this will be necessary on account of the friction of sluices, etc. and the bulk of sand treated. An air blast may be used, as it is occa- sionally in engineering practice or for iiltration purposes, to clear a sand of fine material. A blast of about 1'5 metres per second (about 4'9 feet per second) will carry off aU particles of diameter less than 0"1 mm.
The coating of sea salts around the grains of dune- and shore- sands does not appear to be objectionable f...or glass-making (as it is when such sands are used for building purposes), simikr salts being added in the batch. The sands have the advantage of being well-gi-aded (see Table II.) as a result of repeated sorting by wind and water, but since their colour is not good and they often contain abundant shell-fragments, it is clear that repeated washing of sands will not produce purity without the intervention of living organisms and percolation of water {if., for example, the patchi- ness of colour in the red sands of the Permian and Trias due to reduction around organic remains).
What to read after A Memoir On British Resources of Sands Suitable for Glass-Making ..?
You can find similar books in the "Read Also" column, or choose other free books by Boswell, P. G. H. (Percy George Hamnall), B. 1886 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The use of a greater velocity than this will be necessary on account of the friction of sluices, etc. and the bulk of sand treated. An air blast may be used, as it is occa- sionally in engineering practice or for iiltration purposes, to clear a sand of fine material. A blast of about 1'5 metres per second (about 4'9 feet per second) will carry off aU particles of diameter less than 0"1 mm.
The coating of sea salts around the grains of dune- and shore- sands does not appear to be objectionable f...or glass-making (as it is when such sands are used for building purposes), simikr salts being added in the batch. The sands have the advantage of being well-gi-aded (see Table II.) as a result of repeated sorting by wind and water, but since their colour is not good and they often contain abundant shell-fragments, it is clear that repeated washing of sands will not produce purity without the intervention of living organisms and percolation of water {if., for example, the patchi- ness of colour in the red sands of the Permian and Trias due to reduction around organic remains).
What to read after A Memoir On British Resources of Sands Suitable for Glass-Making ..?
You can find similar books in the "Read Also" column, or choose other free books by Boswell, P. G. H. (Percy George Hamnall), B. 1886 to read onlineMoreLess
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