= : os Seientific American. | EHS ADVOCATS OF VOLUME VIL] [NUMBER 11. THE metal platforms, two safety ballast supporters, Scientific American, bb, which are suspended by chains to a strong CIRCULATION 16,000. swivel hook, c. This ballast partly sinks the PUBLISHED WEEKLY At 128 Fulton street, N.… … servicable. Each pump has four cocks to pro- Pittsburg and her Railroads. duce alternately the expansion and compres- Pittsburg will soon be the focal point of or leakage could result. It will be understood invention of Mr. T. Maskill, Franklin, St. Ma- sion of the air, and the expulsion or, supply…
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