nstead of at its full ca- into a shallow pool, well warmed by the sun. Here diameter of each hole is about }>{ inch. In each of these pacity, and three per cent of this power was lost in heat, the minnows that soon develop are nursed until strong holes is placed a porcelain insulator having a… … G£N££ATING STATION OE IH£ NIAGABA FALLS POWER COMPANY, SHOWING THE ELECTRIC HEATERS, ) 1897 SCIENTIFIC AMERICAN, INC.
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