File:The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world (1908) (14597957590).jpg

Identifier: americanaunivers03newy (find matches)
Title: The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world
Year: 1908 (1900s)
Authors:
Subjects: Encyclopedias and dictionaries
Publisher: New York : Scientific American Compiling Dept.
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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n as the Beekmantown beds.An equivalent formation is found in the mag-nesium limestones of Iowa and Missouri. Calcimine, a mixture of zinc-white, glue,water, and pigments, used to finish the plasterwalls of buildings. See Whitewash. Calcination, a term now used as practi-cally equivalent to roasting or oxidation. It isderived from the Latin word calx, meaningquicklime, and received its present significationby extension from its original meaning ofobtaining lime from limestone by the applicationof great heat. By calcination many substancesare reduced to a friable condition, and freedfrom constituents capable of passing off in theform of gas or vapor. Thus various salts maybe deprived of water of crystallization, and ren-dered amorphous in this way; the hydrated car-bonate of magnesium is reduced to the pureoxide, known as calcined magnesia; limestone isconverted into quicklime, etc. Calcination isusually the first process in the extraction ofmetals from their ores. The oxides of metals
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Photograph by J. H(.;racc McFarland Cc. CALCEOLARIA (FISHERMANS BASKET).

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