Home >> Engineer's And Mechanic's Encyclopedia >> A Vacuous Space In to And Saw Mills Saws >> Biscuit


dough, machinery, flour, frames, establishment, frame, following, feet and biscuits

BISCUIT. A species of unleavened bread. There are several sorts of bis cuit, each having a distinguishing name ; but the most important, from its very great consumption, is the sea biscuit, destined for the use of shipping. A new baking establishment having been recently formed at the Royal Clarence Vic tualling Establishment, at Weevil, near Portsmouth, urn a scale of magnitude nearly sufficient to supply the whole royal navy with biscuit, and that of a very superior description, the following account, taken from the United Service lamed will, we trust, be acceptable to our readers. " It having been discovered that the flour supplied to government by contract had, in many instances, been most shame fully adulterated, the corn is around at mills comprised within the establish ment, and by which means the introduction of improper ingredients is prevented, and precisely the proportion of bran which is requisite in the composition of good sea-biscuit is retained, and no more. The flour-mill is finnished with 10 pair of stones, by which 40 bushels of flour may be ground and dressed, ready for in an hour. The baking establishment consists of 9 ovens, each 13 feet long by 11 feet wide, and 17i inches in height. These are each heated by sepa rate furnaces, so constructed, that a blast of hot air and fire sweeps through them, and gives to the interior the requisite dose of heat in an incredibly short space of time. The first operation in making the biscuits consists in mixing the flour, or rather meal and water ; 13 gallons of water are first introduced into a trough, and then a sack of the meal, weighing 280 lbs. When the whole has been poured in by a channel communicating with an upper room, a bell rings, and the trough is closed. An apparatus, consisting of two sets of what are called knives, each set ten in number, are then made to revolve amongst the flour and water by means of machinery. This mixing lasts one minute and a half, during which time the double set of knives, or stirrers, make twenty-six revolutions. The next proceu is to cast the lumps of dough under what are sailed the breaking-rollere--huge cylinders of iron weighing 14 cwt. each, and moved horizontally by the machinery along stout tables. The dough is thus formed into large rude masses, 6 feet long, by 3 feet broad, and several inches thick. At this stage of the business the kneading is 0611 very imperfect, and traces of dry flour may still be detected. These great masses of dough are now drawn out, and cut into a number of smaller masses about a foot and a half long by a foot wide, and again thrust under the rollers, which is repeated until the mixture is so complete that not the slightest trace of any inequality is discoverable in any part of the mass. It should have been stated that two workmen stand one at each side of the rollers, and as the dough is flattened out, they fold it up, or double one part upon another, so that the roller, at its next passage, squeezes these parts together, and forces them to mix. The dough is next cut into small

portions, and being placed upon large flat boards, is, by the agency of machinery, conveyed from the centre to the extremity of the baking-room. Here it is received by a workman, who places it under what is called the sheet roller, but which, for size, colour, and thickness, more nearly resembles a blanket. The kneading is thus complete, and the dough only requires to be cut into biscuits before it is committed to the oven. The cutting is effected by what is called the cutting-plate, consisting of a net-work of 52 sharp edged hexagonal frames, each as large as a biscuit. This frame is moved slowly up and down by machinery, and the workman watching his opportunity, slides under it the above described blanket of dough, which is about the size of the leaf of a dining-table ; and the cutting-frame, in its descent, indents the sheet, but does not actually cut it through, but leaves sufficient substance to enable the workman at the mouth of the oven to jerk the whole mass of biscuits, un broken, into the oven. The dough is prevented sticking to the cutting-frame, by the following ingenious device; between each of the cutter frames is a small flat open frame, movable up and down, and loaded with an iron ball, weighing several ounces. When the great frame comes down upon the dough, and cuts out 52 biscuits, each of these minor frames yield to the pressure, and are raised up; but as soon as the great frame rises, the weight of the balls acting upon the little frames thrusts the whole blanket off, and allows the workman to pull it out. One quarter of an hour is sufficient to bake the biscuit, which is after wards placed for three days in a drying room, heated to 850, or 900, which completes the process." The following statement of the performance of the machinery is taken from actual experiment : in 116 days, during 68 of which the work was continued for only 71 hours, and during 48, for only 51 hours each day, in all 769 working hours, equal to 77 days of 10 hours each, the following quan tity of biscuit was baked in the 9 ovens ; viz. 12,307 cwt.=.1,378,400 lbs. The wages of the men employed in baking this quantity amounted to 2731. 10s. 91d.; if' it had been made by hand the wages would have been 9331. 5s. 10d ; saving in the wages of labour, 659/. 7s. Oid. In this is not included any part of the interest of the sum laid out upon the machine, or expended in keeping it in order. But in a very few years, at such an immense rate of saving, the cost of the engine and other machinery would be repaid. This admirable apparatus is the invention of T. T. Grant, Esq. Storekeeper of the Royal Clarence Vic tualling Establishment, who, we believe, has been rewarded by a grant of 2,0001. from Government.