The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 476
... known amount of a pure element , are then compared with the spectra of the unknown material . If the operating charac- teristics of each of the arcs and of the spectrometer are maintained constant , and care is taken that all of the ...
... known amount of a pure element , are then compared with the spectra of the unknown material . If the operating charac- teristics of each of the arcs and of the spectrometer are maintained constant , and care is taken that all of the ...
Page 787
... known chiefly from meteorites , all occur as ore minerals formed at depth in the earth's crust . Sphalerite group . Four minerals : sphalerite , ZnS ; met- acinnabar , HgS ; tiemannite , HgSe ; and coloradoite , HgTe , belong to this ...
... known chiefly from meteorites , all occur as ore minerals formed at depth in the earth's crust . Sphalerite group . Four minerals : sphalerite , ZnS ; met- acinnabar , HgS ; tiemannite , HgSe ; and coloradoite , HgTe , belong to this ...
Page 988
... known as Navruz , which takes place on March 21 , the period of the vernal equinox . A festival celebrated after the gathering of the cotton crop is another . These festivals are colourful af- fairs , incorporating horse races and ...
... known as Navruz , which takes place on March 21 , the period of the vernal equinox . A festival celebrated after the gathering of the cotton crop is another . These festivals are colourful af- fairs , incorporating horse races and ...
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