Assertion: steam engine's piston | /r/CapableOf | pass by means of a cam
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Source sentences:
text: c is a rectangular piston firmly connected to the smaller cylinder x, and furnished round its sides with metallic packing; g,g are two sliders moving in steam tight cases i, and in rebates formed in the cylinder covers; they form the steam abutments, and are drawn alternately within the slide cases, to allow the piston to pass by means of a cam on the shaft, which operates on crossheads attached to the slide rods, which latter work in stuffing boxes.