Word: quartz
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Dates: during 1920-1929
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...type of quartz mercury vapor bulb for generating ultraviolet light developed...
...clock, after which Mr. and Mrs. Harlowe Shapley will hold a New Year's Eve party. Wednesday is to be devoted mainly to the reading of more papers. On Thursday, the General Electric plant in West Lynn is to be visited, specially to see the work on fused quartz mirrors...
...size and shape after stretching. Rubber does not do that. Pull a piece of rubber, release it, measure it. It is deformed. Old rubbers are bigger than new ones. Steel is far more elastic than rubber, but of course much less stretchable. Glass is probably more elastic than steel. Quartz is an almost perfect elastic. Hence its use in nice measuring instruments such as telescopes...
...practical operation Professor Goddard suggested last week a mirror 20 feet in diameter focusing on a boiler with a fused quartz base. The boiler would contain, instead of pulverized carbon, mercury sprayed continuously at the focus point of the reflected light. The mercury spray would turn instantly to mercury vapor and in turn vaporize the water which would operate a steam turbine. The turbine would operate an electric generator. Efficiency of such a sun engine would be 50% of the sun energy fused.* Professor Goddard calculates that such an engine would produce 30 h.p. while operated under a clear...
...comparison with the results of the previous eclipses. In addition to this, the expedition is equipped with a variety of lenses for rapid photography of the outer reaches of the Corona. A special Ultra Violet camera is being taken from the Mt. Wilson Observatory, which has a silvered quartz lense especially designed for the purpose of photographing this phenomenon in invisible light of too high frequency to effect...