cap, and all the others willbe turned equally by the wheel and pinions. In the figure annexed a is the piston rod, b b the wheel fit-ted loose upon it, c, c, c, c, c, pinions forming the heads of thescrews that compress the packing, d square head formed uponone of the screws, by adapting a key to… … 88. Metallic packing appears likely to supersede all others,and has already done so in many instances. The earliest at-tempt at a substitute of metal for hemp was made by Cart-wright. Two rings of metal, accurately ground to fit thecylinder, are interposed between the upper and lower parts ofthe…
Steam-engines
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