Technology Notes

> "Corronizing," a new metal-plating process, can cut by 50 to 90% the amounts of zinc and tin now used to galvanize and tin-plate iron and steel. With ordinary electroplating equipment, a thin film of nickel is first deposited on the metal, then a layer of zinc or tin much thinner than usual is added. Baking then fuses the two coats into an alloy whose exceptional resistance to rust and corrosion has already been demonstrated on wire screens, and on Sears, Roebuck's insecticide spray tanks. Even though small amounts of nickel are required, the net result is a goodly saving in scarce metals.

> Silvered-glass reflectors are replacing polished aluminum in street lamps now being manufactured, not only conserving the more useful metal but increasing the lamp's efficiency by 10%.

> Frequency modulation has just been adapted to telegraphy in Western Union's New York-Buffalo-Chicago-Washington-Atlanta network. It will prevent sharp weather changes from disrupting wire communications.

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