Monel Metal. J. F. TmoMrsoN. (Eng. and Min. ]., xci, 223. ) --This alloy is made from the nickel-copper ores of Ontario and contains about 68 per cent. of nickel and a little iron. It is nearl) as strong as steel and is as non-corrosive as copper or brass. The rolled metal is used for roof covering, screens and mining pumprods. Large castings of monel metal are used for the propellers of turbine-driven ships. After a year's service this proved so satisfactory that the U. S. Government now specify this metal for propellers." Other navies use this metal. The cast metal has a tensile strength of 82,500 pounds per square inch, an elastic limit of 37,500 pounds per square inch and elongation 4,4 per cent. The modulus of elasticity is from 22~ooo,ooo to 23,0o0,0o0 pounds as compared with 30,000,000 pounds for steel and I3,OOO,OOO for manganese bronze. Castings can be produced up to 3o,ooo pounds weight in one piece. Its melting point is I36oΒ°C., its specific gravity 8.87 (cast) ; electrical conductivity is 4 (copper ioo) ; shrinkage in, per foot; hardness (cast) 22, (rolled) 27 by the Shore seleroscope. It retains its mechanical properties at a high temperature. At IoooΒ°F. monel metal retains 80 per cent. of its tensile strength and elastic limit, while steel only retains 71 per cent. and manganese bronze only 60 per cent., while copper loses 60 per cent. at 78oΒ°F.