een had been charged with compressed air at wany two front disks were of common hard rubber, js inch years ago in the columns of this journal, of the very thousand pounds pressure, and that when the stop- in thickness, while the third disk, which was placed simplest and most transparent kind: in… … brass tubing, mallet (his pur- of just the size pose being to delay the tap- and strength It is needless to say ping until after the discharge). to match the strength of the steel reservoir, and corre- ing, 7, of an inch thick. The disks are shown in full that Keely refused. sponding to the tubing…
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