f a mixture of peroxide of man- structed on ‘‘ Norton’s Patent Wood Slab Pavement” sys- Holly pump, as shown in Figs. 2 and 3. For the rotary pump, ganese and crushed retort carbon, inclosed in a porous vase tem, was laid down. Theslabs are 7 feet 6 inches by 3 feet, around a large carbon plate.… … on which it was laid was also The ends of the revolvers are found to be in exactly the same ground to the ends of the cylin- condition as on the day it was first put down.—Builder. tive electrode. With this combination the expenditure of ders in which they turn. The pump is precisely like the…
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