The New Encyclopaedia Britannica, Volume 23Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 173
... light . Previous to this the only colour had been the bluish - white light produced by a mixture of sulfur , saltpetre , and orpiment . These blue lights , as they were called , were and still are often used at sea for signalling and ...
... light . Previous to this the only colour had been the bluish - white light produced by a mixture of sulfur , saltpetre , and orpiment . These blue lights , as they were called , were and still are often used at sea for signalling and ...
Page 318
... light ad- vanced by Thomas Young . He served as an engineer in various departments of France but lost his post temporarily during the period fol- lowing Napoleon's return from Elba ( 1814 ) . Fresnel , detail of an engraving by Ambroise ...
... light ad- vanced by Thomas Young . He served as an engineer in various departments of France but lost his post temporarily during the period fol- lowing Napoleon's return from Elba ( 1814 ) . Fresnel , detail of an engraving by Ambroise ...
Page 327
... light that are in phase or out of phase with one another . Light waves and similar wave propagation , when superim- posed , will add their crests if they meet in the same phase ( the waves are both increasing or both decreasing ) ; or ...
... light that are in phase or out of phase with one another . Light waves and similar wave propagation , when superim- posed , will add their crests if they meet in the same phase ( the waves are both increasing or both decreasing ) ; or ...
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