This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 edition. Excerpt: ...in quantity so far as this surface is concerned, but once past these purifiers there is not usually that necessity for re-purifying as exists in the matter of hard wheat, because the line of pure and impure is more sharply drawn, and the former are practically more free from bran chips, and so can go to a ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 edition. Excerpt: ...in quantity so far as this surface is concerned, but once past these purifiers there is not usually that necessity for re-purifying as exists in the matter of hard wheat, because the line of pure and impure is more sharply drawn, and the former are practically more free from bran chips, and so can go to a further reduction with less danger than would be the case were their nature the opposite. To go over the ground of purifiers and purification in the form of giving a few questions which involve the main principles treated therein may help to engraft into the reader's mind some of the essentials connected with the operation, and may also be of benefit for future reference: --1. Purification: What is it, and for what purpose is it considered necessary in modern flour milling? 2. What is the best state for the feed to be in so as to get the highest results? 3. What machine or machines are best adapted to preparing coarse, medium and fine middlings for purifiers? Give the number of the silk mesh through or over which the various first grades given above separate, and why do they not go together to one machine? 4. Explain three different ways of compressing and expanding the air drawn through the sieve, and state the law governing all such operations? 5. What are cut-offs? What purpose do they serve? State any particular difference in their composition from that not so dealt with. 6. Point out some of the difficulties of purification when stock is not dusted properly, not well graded, and when in bad condition owing to the damp condition of the wheat. 7. Give the remedy for the state of things mentioned in question 6, and if more than one specify in detail. 8. Mention the chief moving parts of a sieve purifier, usual sizes of driving and driven..
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