ot a good diagram, understood, cannot be too highly estimated. ‘The efficiency son, asking the reason why the magnetic needle points to while the reverse is true. and economy of every engine made or sold ought to be the north. In reply Professor Patterson wrote as follows, The manufacturers of the… … net, 40 inches long, strongly magnetized, at a distance of coal wagons to the can pile, and soon had his smelter running one foot. on ore and tin cans. The latter supplied the needed ele- The foregoing is the accepted explanation of the fact that ments, and the Duquesne will not run out of “flux”…
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