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Encyclopedia of architecture : a dictionary of the science and practice of architecture, building, carpentry, etc., from the earliest ages to the present time, forming a comprehensive work of reference for the use of architects, builders, carpenters, masons, engineers, students, professional men, and amateurs (1852)

Nicholson, Peter, 1765-1844, Lomax, Edward, Gunyon, Thomas · New York : Johnson, Fry & Co. · leaf 472

An illustration from Encyclopedia of architecture : a dictionary of the science and practice of architecture, building, carpentry, etc., from the earliest ages to the present time, forming a comprehensive work of reference for the use of architects, builders, carpenters, masons, engineers, students, professional men, and amateurs, 1852, leaf 472
e writers have reckoned five species of rocks belong-ing to the proper porphyritic formation, which are as follows :viz., 1, llorn-sloitc jMrpliyry, the base of which, being horn-stone, is generally red or green, with a conchoidal, or splin-tery fracture; and enclosing crystals of quartz and…

Architecture · Architects

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