similar expression.” speaks of the antiquity of that useful tool as follows: ing means for a quick exhaust, and Fig. 3 is aninverted It now transpires that the square was known and used ‘Pliny says that Theodorus, a Greek of Samos, plan view of the valve. The cranks are placed at an by the ancient… … about hot eyes. Dr. Thomalla, of one of the power at a time, and remaining in power BLANCHARD’S DUPLEX STEAM ENGINE. Berlin accident wards, has devised a specta- while the crank arm is passing through an cele made of Schering’s gelatoid, an elastic perfectly for the square figures in the…
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