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Scientific American, Vol. 67, No. 12 (September 1892) (1892)

leaf 3

An illustration from Scientific American, Vol. 67, No. 12 (September 1892), 1892, leaf 3
VED BOLT-THREADING MACHINE. automatically. An inlet, threaded to receive a screw which it is destined. The tungsten can be added, The screw-cutting die head, or bolt-threading ma- alloyed with other metals ; still the most advantageous chine, shown in the illustration in perspective and in way… … making a reliable and labor-saving BECHEB'S BEVOLVING-TURRET BOLT-THREADING MACHINE* BOOS' FILLING APPABATU8. © 1892 SCIENTIFIC AMERICAN, INC.

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