n comes to rest, by Mr. Hermann Betten, is designed to utilize promote safety in blasting, providing for such pur- the chain is slightly slackened, and the locking device pose a simple and very efficient means of safely holding ‘then disengages itself, and the chains with the straps and… … open bearing at its top end, and upon each of which BETTEN’S ROTARY ENGINE. freely revolves a steel wheel having a central axis. The belts run over these wheels and are shifted by a simple form of fastening. On each side of the inner sist of two parts bolted together, and the piston, se- very novel…
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