ther parts can yield, and can readers the danger of breakage much more imminent. | tailed into A. The key, M, is kept from working out of place ‘by a pin shown in the small end. By elevating the cam To obviate these difficulties it has been customary in times be easily replaced at a trifling… … kind of work, cally adjustable amply prove. jaw, having a Our engrav- slot in which a connecting pin, G, Figs. 1 and 2, is secured. The latter is ings show distinctly an improved construction of this es- and positions, and clamped therein by pressing the key, M, pointed, and it is flattened near…
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