I. 17.

280

SCHEDULE 8. The Relationship between the Per-cent. Extraction or the Number of Pounds of Flour from 60lb. of Wheat and the Number of 4lb. Loaves of Bread.

Explanation. Column 1 gives the various percentage extractions of flour from clean wheat, or, in other words, the pounds of flour obtainable from 100 lb. of wheat. This percentage varies with the type of wheat, the moisture - content of that wheat, the mechanical efficiency of the mill, and the personal milling knowledge of the miller. I would say that 72 per cent, is an average. Column 2 is arrived at by multiplying 60 lb. of wheat by the percentages in column I—that is, 39'6 lb. of flour equals 66 per cent, of 60 lb. of wheat, or, in other words, at a 66-per-cent. flour-extraction one gets 39-6 lb. of flour (note). Some mills calculate this percentage extraction on clean wheat—that is, wheat that has been cleaned and scoured —while others calculate it on their dirty wheat. Since wheat may contain from 0-5 to a high percentage of weeds, tares, chaff, &c., the man who calculated on a clean wheat basis will show a high extraction.

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1. 2. 3. 4. 5. Is. less T-lnnr P er Bushel oI ntnntinn Flour. Dough. 41b. Loaves. Wheat equals extraction. so-much less per 4 lb. Loaf. PerCent. lb. lb. Number, i Farthings. 66 39-6 60-5 14-4 3-33 67 40-2 61-5 14-7 3-26 68 40-8 62-4 14-9 3-22 69 | 41-4 63-3 15-1 3-17 70 42-0 64-2 15-3 3-13 71 42-6 65-1 15-5 3-09 72 43-2 j 66-0 j 15-8 3-03 73 43-8 1 67-0 I 16-0 ! 3-00

1. 2. 3. 4. 5. Is. less Flnnr P er B "S he l « f ovtroJtim Flour. Dough. 4 lb. Loaves. Wheat equals extraction. so-much less per 41b. Loaf. PerCent. lb. I lb. ! Number. Farthings. 74 44-4 : 67-9 ! 16-2 2-96 75 45-0 68-8 16-4 2-92 76 45-6 69-7 16-6 2-89 77 4G-2 70-6 16-8 2-85 78 46-8 71-6 17-1 2-80 79 47-4 72-5 17-3 2-77 80 48-0 73-4 17-5 , 2-74