The following pro perties of chromium, deposited under a wide variety of plating conditions, 11ave bee n measured ; densi ty, hardn ess, tensile s trength, Young's mod ulus of elasticity, ductili ty, electr ical res istivi ty, and stress in t he deposit. The oxygen and h ydrogen content were d etermined. The effect o f heat treatments up to 1,200° C on certain of these properties has been determin ed, and so me work has been done on t he properties of chromium-iron alloys deposited from modifi ed chromi c acid solution s. A relation between the hydrogen alld oxyge n content of the deposits has been shown to exi st, and the effect of the oxygen co ntent on the physical properties has bee n studi ed.

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