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TRASS

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Originally appearing in Volume V27, Page 215 of the 1911 Encyclopedia Britannica.
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TRASS , the See also:

local name of a volcanic See also:tuff occurring in the See also:Eifel, where it is worked for See also:hydraulic See also:mortar. It is a See also:grey or cream-coloured fragmental See also:rock, largely composed of pumiceous dust, and may be regarded as a trachytic tuff. It much resembles the See also:Italian puzzolana and is applied to like purposes. Mixed with See also:lime and See also:sand, or with See also:Portland See also:cement, it is extensively employed for hydraulic See also:work, especially in See also:Holland; whilst the compact varieties have been used as a See also:building material and as a See also:fire-See also:stone in ovens. Trass was formerly worked extensively in the Brohl valley and is now obtained from the valley of the Nette, near See also:Andernach.

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