Metal-work; a handbook for teachers and students (1914)
Adam, Hugh M. [from old catalog], Evans, James Humphrey, [from old catalog] joint author · New York, Longmans, Green and co.; London, E. Arnold · leaf 132
that the size stamped uponthe tool is the diameter of the bolt the nut of which the spanneris intended to fit. The British standard for nuts across theflats is one and a half times the diameter of the bolt plusJ inch. Therefore a spanner stamped J inch would be oneand a half times | inch plus J… … Fig. 77. dealing with decorative work in the softer metals, and alsoin light work with the harder metals. The type shown iscapable of extension up to 6 inches, but the most usefulsize and make of blade is the round back blue, 4 to5 inches long. The piercing saw carries the blade with the teeth…
Metal-work
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