The bodies of the cars used with this drier are made of wrought ehannel-iron, a rigid open framework, on which the pallets are. piled. A boy can transport 504 bricks on one of them.
The "pallets" consist of two strips of channel-iron seen red at either• end to a handle whose height. is greater than the width of the brick. These handles are so constructed that when the pallets are piled one on top of the other, they are securely interlocked. At each end of the flues is a transfer or switching car, which transfers the loaded cars from a single track, running from the machine, on to any one of the six twining into the flues; and in like manner from any one of the six flues to the track running to the kilns. The loaded ears are transferred into any one of the kilns by means of transfer-cars, and the empty ones returned to the machine by a return track, outside of the flues. Each car, with its load of sixty-three pallets. is brought to the side of the brick-machine. One man transfers the empty pallets from the car to the " pallet-carrier," which carries them along parallel with the off hearing belt, and close to it, at a convenient speed, to enable the " off-bearers " to hack the bricks upon the pallets. The motion of the pallet-carrier is continuous, and when a pallet has received its quota of eight bricks it reaches a point opposite an empty drying-car. Here one or more men, as the capacity of the machine may require, lift the loaded pallets from the carrier to the car, When the car is full it is ready to be drawn to the drier, and another that has just been emptied takes its place. The loaded ear is then run on to the transfer-car, and thence into any one of the flues, where a current of heated air (an artificial summer breeze) is forced through them, the steam from the bricks near the fire condensing on the surfaces of the cold ones and preventing checking or cracking, while the bricks absorb the heat from the steam and commence drying from the inside first. When the bricks directly over the fire are dry, the car is run out to the kiln to be set, a fresh car being put in at the upper end, pushing the others down and bringing a not her par tially dry car immediately over the fire, and so on. It is claimed that one ton of anthracite coal will thus dry 25.000 bricks; hence the expense of artificial drying is less than that of sunshine.
Figs. 11 to 17 represent. a varietvof improved brick-yard appliances.. Fig. 11 is a platform spring-truck suitable for handling green bricks when placed upon pallets. Fig. 12 is a double-deeked
dry car, on which the bricks are hacked four courses high on the lower deck and three courses high on the upper deck. Fig. 13 is a revolving dump- table. Fig. 14 is a barrow designed for wheel ing green or burned bricks. Fig. 15 is a brickmaker's strike-knife. Fig. 16 is a wrought-iron interlocking pallet for stiff-tempered bricks; and Fig. 17 is a steel pallet for bricks molded on flat side, or for those stiff enough to stand on edge.
13 rimeli. Chit tic] Ng:: see Quarrying Machinery.
/Vicki/son & Waterman's Pigs. 1, and 2 show a bronehing-machine built by Nivholson & Waterman, Providence. U. 1., ar ranged for milling the sides of nuts and bolt-heads. The cutters consist of st might mills, with teeth set angling and slightly hooking. Two sides lire finished at one pass. The cutlers are set in a swivel-heaul, and approach each other at the bottom. The head swings from under the plunger to facilitate the entering of work. Onide or holder blocks secure the uniformity of angle, centralization of holt-head or nut. and serve as a gauge for uniform size. The action of t he plunger is automatic in its return. :1 rotary pump feeds lubricant upon the work from a tank placed under the working top. The piing' ife upon wide)) the rutting is done is that of a shaving or drawing cut. The mit or bolt is forced down het weep the mills, and is guided centrally. The time occupied in milling two sides is about four seconds; for the six sides, twelve seconds. The remain der of the time is taken in handling the work, the conveniences at hand and the dex terity of the operator having much to do with the product. As high results have been obtained as two finished hexagonal bolt-heads per minute. Under the worst conditions, it is claimed that a product of 500 hexagonal nuts per each ten hours can be obtained. For bolt-heads the product is considerably more, as the time in screwing a nut on to its pin (in order to mill centrally with the thread) is saved. A broaching-ma chine made by The Pratt & Whitney Co., Dartford, Conn., is designed for broaching holes of such diametrical form that they can not be finished by rotary motion, as drilling or reaming. It will work cavities up to 21, in. diameter. It is adapted also for draw ing or for finishing the outside of work.
Bronze: see Alloys.
Bucket, Dredging: see Dredgers and Excavators.
Middle: see Ore-Dressing Machines.
Burglar.Proof Construction: see Safes and Vaults.