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Bicolour crystals occur that are pink at one end and green at the other; concentric
colour zoning may also occur. The coloured varieties, when transparent and free
from flaws, are cut as gems. Tourmaline is very abundant and has the best ...
influenced by the Synthetist works of Gauguin's Pont-Aven period. That stimulus
is apparent in Vuillard's “SelfPortrait” (1892; Sidney F. Brody Collection, Los
Angeles), by the modelling achieved through broad patches of vibrant colours.
He used his new wave theory of light to explain the colours of thin films (such as
soap bubbles), and, relating colour to wavelength, he calculated the approximate
wavelengths of the seven colours recognized by Newton. In 1817 he proposed ...
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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