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Scientific American, Vol. 47, No. 20 (1882) (1882)

leaf 7

An illustration from Scientific American, Vol. 47, No. 20 (1882), 1882, leaf 7
ular lead forward, the other a lead back- the ill effects produced by the growth and propagation of these so-called disease-ferments. The porous, internal sur- ward. By asimple lever arrangement either pair of brushes can be pressed at will against the segments of the commuta- face of a wooden… … steel is maintained, notwithstanding the reheating and even conducts heat more readily than wood. With regard to the NEW ELECTRIC BOAT. forging; it is permanent and indelible whatever be the sub- latter objection we do not consider it a very serious one, for 25 feet long, 5 feet beam, drawing 21…

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