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& Grim. effective are9.S on opposite sides. The high.pressure cy-crushed by stamps, and passes three sieves. The siftings shaw, of London, have patented an ingenious fire-alarm linder receives steam direct from the boiler during a part of the first sieve are put under the stamps again. The and indicator. It consists of a small cylinder of thin of the stroke, and the steam then finds egress through a sifting of the second sieve is as fine as the grain of wheat, metal, to contain atmospheric air.doi:10.1038/scientificamerican11121859-318 fatcat:scxijkooyzdxplbvcu4bdhdg5m