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Scientific American, Vol. 57, No. 20 (1887) (1887)
leaf 4
ng or cutting of a valve is shown at the left in Fig. 1, the centering end of the upper centering shaft fitting on the top of the valve stem, and the centering end of the arbor en- gaging the lower end of the valve, held in the cutter, when the operator turns the crank arm’ with one hand wheel with… … tating the removal of the goods from the shelves. © 1887 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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