ice. are generally unreliable and troublesome to fit. First, it is This device was patented through the Scientific American ble block, the upper part of which difficult to cast them ; secondly, they are difficult to turn ; and, Patent Agency, March 24, 1868, by Thomas Curley, who may holds two… … breaking the bar ; such a bar is of no use fora magnet. Tha to be destroyed or even injured by the obstructions offered The plan shown in the engraving appears to be the most cracks in the bar divide it into a series of small magnets. by inequalities of the surface of the pipe. feasible and…
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