. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . e pressure comes too hard on it. It willwork on an incline of 1 ft. in 10 with safety. Where the incline is too steep, a drum on oneof the axle-trees is used of the same size as the tread of the wheel, with a wire rope attachedto it, and made fast to a plug at the upper end of the cut. This is wound upon the spool goingup, and unwound coming down, making a positive feed. Four cutters are used in a gang ofdrills in s
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . e pressure comes too hard on it. It willwork on an incline of 1 ft. in 10 with safety. Where the incline is too steep, a drum on oneof the axle-trees is used of the same size as the tread of the wheel, with a wire rope attachedto it, and made fast to a plug at the upper end of the cut. This is wound upon the spool goingup, and unwound coming down, making a positive feed. Four cutters are used in a gang ofdrills in sandstone. The two outside drills are chisel-shaped points, cutting at right angleswith the channel. The two inside drills cut diagonally across the channel. The speed onthe track is three-quarters of an inch at every stroke, and may be 200 revolutions with bothsides working all the time. With the four drills the bottom of the channel is kept smoothand free from frogs. The frame is constructed of channel steel and steel I-beams,bracketed together with malleable iron brackets and boiler rivets. Some recent improvements have been made in the Bryant channeler, notably a sliding. Fig. 1. —The Bryant channeler. 700 QUAKRYING MACHINERY. box for holding the gibs, and which admits of their being dropped into a pocket so that thearm holds them in their place, and if they break they cannot get out of place. The oldmetliod was lo hold the gib in the box by anenlarged head, which was liable to break, result-ing in the dropping of the gib into tlie cut. By means of the improved gib box on theBryant channeler it has been found advantageous to use gibs made of hard wood. Theseluive proved to be much better and more durable than brass. The wooden gibs absorb theoil and make but little noise ; they wear as long, and cost very much less than brass. Theimportance of tiie wooden gib is shown by the fact that the Cleveland Stone at Cleveland,Ohio, whicli has a large number of channeling machi
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
