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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From the mid-20th century, new techniques, such as optical pumping, the
principle on which the laser works, opened the radiofrequency and microwave
regions for atomic spectroscopy, and the precision of all measurements
(These are not the outermost, or valence, electrons but are farther in the interior
of the atom.) This arrangement produces a large net effect, one that extends to
neighbouring atoms, causing the atoms throughout large portions of the resulting
Thus Descartes could construct an atomic theory without atoms in the classical
sense. Although this theory as such has not been of great value for the scientific
atomic theory of modern times, its general tendency was not without importance.
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LibraryThing ReviewUser Review - keylawk - LibraryThing
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