Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Mini n^- Machine. tile traversing devices. The lilow of the chisel is | of water,similar to that of a drill. Fig. 317i shows a form of mechanical pick e,which is connected to a steam piston-rod b, and bythe operation of .steam in the cylimier is made toimitate the blows of a miners pick when worked byhand. The carriage moves liackward and forward. Mining-Machine
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Mini n^- Machine. tile traversing devices. The lilow of the chisel is | of water,similar to that of a drill. Fig. 317i shows a form of mechanical pick e,which is connected to a steam piston-rod b, and bythe operation of .steam in the cylimier is made toimitate the blows of a miners pick when worked byhand. The carriage moves liackward and forward. Mining-Machine. on wheels, and the pick or cutter slides sidewise inthe ways d d. The machine shown in Fig. 3175 is operated by Mining-Machine. hydraulic pressure, in the cylinder L. The hy-draulic engine gives a steady thrust-motion to thetools ; the position of the machine during the thrustis maintained by a holdfast, which is pressed againstthe roof during the cutting action ofthe tool or tools, and leleased there-from to allow the machine to move for-ward during the return or back strokeof the tool or tools ; the movements ofthis head or feeler and those of tile drillare obtained from the pressure of waterin the cylinder. For other machines of this character,see Machine. Miniiig-pump. Pumpsformines andwater-works liavi liicn on scale, and the former were for a longtime the priiici|ial objects upon which thesteam-engine was employed. The succes-sive improvements of Worcester, Savaiy,Newcomen, and Watt were all directedtoward one object, that of liftin
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