拍品专文
The eccentric cutting frame has a complete brass-flanged disc equal in diameter to the length of slide behind the slide, with a segmental brass weight to balance.
细节
Eccentric cutting frames:
an unusual balanced eccentric cutting frame signed J.H.Evans; a double eccentric cutting frame with 6-inch slide and two tool-holders each with setting-screw, both 9/16in. square shanks; and an extension cutter bar - 9/16 x 3/8in. square shank (3)
an unusual balanced eccentric cutting frame signed J.H.Evans; a double eccentric cutting frame with 6-inch slide and two tool-holders each with setting-screw, both 9/16in. square shanks; and an extension cutter bar - 9/16 x 3/8in. square shank (3)