Collins, A. Frederick (Archie Frederick), 1869- · Boston, Small, Maynard and company · leaf 132
sk and make it %6 inch in diameter onthe other side. Put the two disks together and drill a %2-inch Fittings for Model Engines nj hole on each side of the holes in the center andthread them; screw the disks together on oneside and then make a standard of a piece of brassrod Ys inch in diameter and… … BRASSPM Fig. 47. A Lever Safety Valve
Steam-engines
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