File:OpticalGlass 021.jpg
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| Description | 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. | |||
| Source | National Institute of Standards and Technology | |||
| Author | National Institute of Standards and Technology | |||
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This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:09, 7 March 2014 | | 4,626 × 5,711 (24.89 MB) | NISTResearchLibrary (talk | contribs) |
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