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| Keywords: OpticalGlass 021.jpg Experimental optical glasses were melted in an electric furnace in a platinum crucible of 15 pounds capacity Temperatures as high as 1500 degrees Celsius were required for some glasses The operator is shown filling the crucible inside the furnace After the charge was melted it was stirred with a rotating platinum-rhodium spoon to produce a homogenous glass of the highest quality The molten glass was then poured into an alloy steel mold to produce a plate of glass of the desired thickness The plate was then cut into pieces of the desired sizes for processing into optical elements for new instruments that were being developed for the U S Navy National Institute of Standards and Technology National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Glass | ||||
