Schwarkzkopf, Ernst · New York : J. Wiley & Sons ; London : Chapman and Hall · leaf 44
THE BLACKSMITH’S TOOLS 27 rectangular grooves of the various standard sizes. The semicircular grooves are used in place of bottom swages, and for this purpose the block is used in an upright position. Fig. 23.—The Square. | The large round holes in the block may be used to hollow . out sheet metal,… … or dimensions and to test thicknesses. Fic. 24.—Compass.
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