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Scientific American, Vol. 21, No. 25 (1869) (1869)

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An illustration from Scientific American, Vol. 21, No. 25 (1869), 1869, leaf 0
= $3 per Annum, } {IN ADVANCE.] {NEW SERIES.] § Acid Rivers. Sinking Screw … and driving a pin- ”~* the island of Su- ion and train of matra there is a spur and bevel lake which contains free nitric acid. All these phenomena are the result of volcanic action. carried in bearings at each end of the crossbeam. off in 29 minutes. The machine altogether does great credit eel…

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