19 August 1988
Vol 241, Issue 4868

About The Cover

Polycrystalline diamond balls grown at high supersaturation using combined hot filament and microwave plasma-assisted deposition. The source gas was 1.5% methane in hydrogen at 10 torr. The diameter of the balls is approximately 18 micrometers. See page 913. [Scanning electron microphoto is courtesy of Thomas Anthony, General Electric Corp., Schenectady, NY]