from corrosion Under this name, M. De Ponvielle has constructed an ap- by associating with them other metals or alloys, the presence paratus for testing the powers of various electric batteries, of which renders the entire combination passive. It is known Using a winged screw, in the form of a… … protects the lead from corrosion, and that there is the power of any motor which he may apply to it. Our en- practically no corrosiv e action upon these metals when asso- '■": >*^ graving shows clearly the manner of its use. With a ciated in this manner. screw of 12 inches diameter and a motor of…
Patents · Improved · Sulphur · Iron · Piston · Scientific American · Crank · Sulphuric acid · Steam boiler · Feed water · Steam engine · Carbonic acid · Turning marks · Valve chamber · Face plate · Square inch
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