07 May 1965
Vol 148, Issue 3671

About The Cover

Structure of chemically deposited nickel taken from a large lump deposit on the wall of a plating tank. Precipitation nuclei are widely separated, and growth is well advanced before impingment interferes with the concentric circle pattern of enlargement. The concentric striations represent periodic variations in phosphorus content of the amorphous nickel. Thise variations result from periodis depletion of the plating solution immediately adjacent. See review of Interpretation of Metallographic Stuctures, page 818.