The gas flame is formed on the principle of the blow-pipe. Three boilers set worked with considerable speed even by an inexperienced this way will make as much steam as five the old way. operator. Boston, Mass. A. F. Upton. The wire testers, Figs. 2 and 8, are the invention of Mr. Carrington, of… … gradually, and by the application of the same weight, all lia- QUICK-SPEED DRILL. case to contain the ratchet and pawl necessary to prevent bility of erroneous tests from changing or moving of weights, of a milligramme of ammonia. as in ordinary machines, is avoided. The extension of the the…
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