The New Encyclopaedia Britannica
Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries - 934 pages
 Propaedia: outline of knowledge and guide to the Britannica.--- Micropaedia: ready reference and index.--- Macropaedia: knowledge in depth.
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In 1802, the ultraviolet was observed by its ability to darken silver chloride. And at
this time, an English scientist noted a few dark lines in the solar spectrum, which
was studied in much more detail by the German physicist Joseph von ...
All these details are noted by careful observations and measurement of details of
the spectrum and, in some cases, of their charges. The rather small class of stars
with unusual spectral characteristics called Wolf-Rayet stars are extremely hot; ...
HII regions can readily be observed in nearby galaxies; in more distant ones, the
brightest lines sometimes show above the stellar continuum. The forbidden
doublet (a spectral line with two close components) of O' at 3,727 A is found this
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review