October 26, 1959
Growing single crystals of inorganic non-metallic materials at the National Bureau of Standards.
Powdered material drops from above through the flame, melts, and forms a crystal on the vertical rod at the base of the furnace.
After closing the furnace, operator Katherine King will continue to check on the process, using an optical filter to look through a slit in the furnace wall.
28238-2-2386 (Fig 12)
Original Caption by Science Service