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English: A pendant prism from a vault light, showing total internal reflection of light
|Source||Ian Macky, http://glassian.org/Prism/3Way/14S/page2.html|
|Author||American 3-Way Prism Co's catalog, "3-Way Lighting Systems", ca 1915, page 2|
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1923.
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|current||03:57, 7 October 2017||401 × 602 (10 KB)||HLHJ||User created page with UploadWizard|
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