The practical metal-worker's assistant : containing the arts of working all metals and alloys, forging of iron and steel, hardening and tempering, melting and mixing, casting and founding, works in sheet metal, the processes dependent on the ductility of the metals, soldering, and the most improved processes, and tools employed by metal-workers, with the application of the art of electro-metallurgy to manufacturing processes : collected from original sources, and from the works of Holtzapffel, Bergeron, Leupold, Plumier, Napier, and others ... (1851)
Byrne, Oliver · Philadelphia : H.C. Baird · leaf 302
vertical plane, a trifling weight is sometimessuspended from the drill shaft by a metal ring or hook; the jogglingmotion shifts the weight to the lower extremity; the tool is onlyhorizontal when the weight remains central. In many cases, the necessity for repeating the shaft and pulleyof the drill… … ±£i>- •347. 298 DRILLS. it has the centre and pulley of the ordinary drill, but the oppositeend is pierced with a nearly cylindrical hole, just at the innerextremity of which a diametrical notch is filed. The drill is shownseparately at a ; its shank is made cylindrical, or exactly to fit…
Metal-work · Electrometallurgy · Metallurgy
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