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See also:BISCUIT (pronounced according to the old spelling " bisket," a Fr. See also:form from See also:Lat. bis, twice, and coctum, cooked, in reference to the See also:original method of preparation; cf. Ital. biscotto, Sp. bizcocho, &c.) , a See also:form of unvesiculated See also:bread (q.v.), which is made in thin cakes of various shapes and baked in such a way as to be crisp and See also:short . In the See also:United States of See also:America biscuits of this See also:kind are usually called crackers, but the word See also:biscuit is used there, as also in the See also:north of See also:England, for vesiculated bread baked in little See also:flat loaves or cakes . Earthenware, See also:porcelain, &c., which has undergone its first See also:baking and is ready to be glazed is also known as biscuit or See also:bisque . The raw material chiefly used in biscuit manufacture is See also:flour, but many other substances, such as See also:butter, See also:sugar, See also:salt, various flavouring essences, &c., are also employed . The flour used by the biscuit-maker differs somewhat from that preferred by the bread-See also:baker . In the See also:main the bread-baker wants flour of some strength, that is to say, flour capable of absorbing a considerable proportion of See also:water and of making a See also:loaf of more or less See also:volume . For biscuits flour strength is not such a desideratum, and as a See also:matter of fact such moisture as is used to make the dough is largely evaporated by the See also:oven; but, except for the commoner kind of biscuits, See also:colour is most essential, as well as sweetness of flavour . In a large biscuit factory several See also:hundred different kinds of biscuits are made, ranging from See also:plain water biscuits to the daintiest See also:fancy biscuits glistening in sugar and piping . The storage required for such an See also:establishment is extensive, but lifts serve to handle both raw material and finished products with a minimum of labour . The flour used by a See also:firm which has a reputation to maintain is sifted as a precaution against the presence of bits of See also:string or other See also:foreign bodies which will make their way into flour sacked by the most careful of millers, and like the butter, sugar and other raw materials, is carefully inspected and tested before being accepted . After blending it is run through a shoot or See also:sleeve to the mixers, which may be of any type used in bakehouses (see BREAD) . From the mixers or kneaders the dough is delivered on a flat table, or it may go See also:direct to a pair of rolls . These consist of See also:iron rollers with a See also:reversing See also:motion, between which the dough is rolled backwards and forwards into sheets of See also:uniform thickness . The next See also:stage See also:BISECTRIX is the feeding of portions of this slab of dough to a cutting and panning See also:machine . In details this apparatus differs as supplied by different makers, but the broad principle is the same in every See also:case . The dough, after first passing through a pair of gauging rollers, which still further thin out the See also:sheet and are capable of regulating its thickness with the utmost nicety, is received by an endless conveyor-See also:band of webbing or similar material . By this band it is carried forward by intermittent motion to a set of punches or stamps which descend on it in See also:quick See also:succession, and serve to See also:mould the See also:surface and cut the edges to the required See also:pattern . This operation completed, the moulded dough passes forward on the same endless band . The dough has now been cut into two distinct divisions, the moulded biscuits and the unworked portion which forms a continuous sheet of a sort of scrap . The latter is separated from the moulded dough, and is carried upwards by another band, which delivers it on a See also:tray or See also:box whence it is returned to the rollers to be reworked . The moulded dough intended for the oven is carried along by the first band and is gently deposited on trays of sheet iron or See also:woven See also:wire . These trays are taken from the machine by boys and placed on the travelling-chains at the oven, or the trays may be automatically moved forward by a travelling-band and placed on the oven . The oven used for biscuit-baking is quite unlike any bread oven . It is much longer and is provided with sets of endless chains moving in parallel lines, and travelling over sprocket-See also:wheel terminals and intermediate supports . The chains have See also:special attachments on which the 'trays of biscuits are rested, and thus pass them through the oven, and See also:discharge them at the opposite end . Some ovens are provided with a sort of endless See also:belt of iron plates on which the biscuits are placed . These travelling bands are used chiefly for See also:ship and also for See also:dog biscuits, but the most usual type is the oven in which trays are moved on the travelling chains already described . The exact See also:rate of travel, or the See also:time during which the biscuits are in the oven, can be easily adjusted by means of countershafts and See also:leather belts See also:running on See also:cone pulleys fitted at the discharging end . The See also:heat of the oven as well as the rate of travel is varied according to the kind of biscuit, some varieties requiring a See also:gentle heat and a comparatively See also:long sojourn in the oven, while others must be exposed to a fierce heat, but only for a few minutes . The ovens, fired by See also:coke, may be 38 to 50 ft. in length . Their temperature is not generally raised above 50o degrees, but the See also:speed of travel of the trays ranges between 32 and 25 minutes . The whole See also:process of biscuit-making is thus rapid and continuous . The dough is kneaded in the mixers in a few minutes, and when discharged on the dough table is rapidly moulded into the required form by the cutter and panner . By means of endless bands the material is kept moving forwards, whether on the cutter or in the oven . For certain fancy biscuits special processes are used . Piping and sugar decoration is still necessarily done by See also:hand, and the glaze on some fancy biscuits is imparted by spraying the moulded biscuit with very See also:fine jets of fresh See also:milk . Cracknels are made from a very stiff dough, and when cut out are thrown into coppers of boiling water . They speedily See also:float to the See also:top, remaining apart and not forming irta See also:groups . From these coppers they are taken out in trays pierced sa as to drain off the water . Then they go into vats of See also:cold water, from which they are again removed, and after being strained of their moisture are panned and baked in a fierce oven . (G . F . |
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