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 258
d the central line of the instrument;the effect of which is to keep the successive portions of the twoedges in contact throughout the length of the cut, as by the timethe scissors are closed, the points of the blades are each sprung backto the central line of the scissors, which is dotted in the… … s and free from shake, as soon as the blades can begin to cut thematerial near the joint, and so to continue tight until they meet atthe points. That all scissors do exhibit this construction may beeasily seen, as when they are closed and held edgeways betweenthe eye and the light, they will be…
Metal-work · Electrometallurgy · Metallurgy
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