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Show Magnt.Inra. 3ragnesium is one-lliird lighter than aluminum, and at tho tame time denser, and harder and tougher. tough-er. Atmospheric influence ii about the same on magnesium and aluminum: alumi-num: but, while alkalies, Mich as ammonia or soJa, attack aluminum considerably, magnesium is not affected af-fected as much. Magnesium is worked work-ed Into oljetts having (harp edges, screws etc.. more readily and with better rcutts. It takes a high pol-L-b, is readily himmered ami rolled, can bo swaged or pressed like tin into in-to any shape. It is -it present about one-fifth cheaper than aluminum. Montreal Star. |