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 265
c, d, the hand has to move through three to four times the spaceit would if applied directly to the shear lever, and consequently the 260 SHEARS. purchase shears have three to four times the force of common shears,supposing the manual lever to be of equal length in each kind.There is usually at the… … Before using shears, in those cases where the stop is not employedto determine the width, it is usual to mark on the work the linesupon which it is intended to be sheared; the shears are then openedto the full, and the extremity of the line is placed in the angleformed by the jaws; if the work is…
Metal-work · Electrometallurgy · Metallurgy
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