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Slate (writing)
==Description==
A writing slate is a thin piece of flat material used as a medium for writing. The slate material itself, a stony substance, is “a metamorphic rock created by the recrystallization of the minerals in shale from clay to parallel-aligned, flat, flake-like minerals such as mica”.〔Robert N. Pierport, “Slate Roofing”, APT Bulletin, Vol. 19(2) (1987), 10.〕 The writing slate consisted of a piece of slate, either 4x6 inches or 7x10 inches, which was encased in a wooden frame.〔“Standard Sizes of Blackboard Slate”, U.S Department of Commerce: National Bureau of Standards (1966), 3.〕 A precise date range for writing slates of this type remains unclear. Usually, a piece of cloth or slate sponge was used to clean it and this was sometimes attached with a string to the bottom of the writing slate. Typically, the writing slate was used by children during the days of the one-room schoolhouse to practice writing and arithmetic during classes or at home. Writing slates, however, were also used in multi-room schools until the twentieth century. The writing slate was also sometimes used by industry workers to keep track of goods and by sailors to calculate their geographical location while at sea. Sometimes multiple pieces of slate were bound together into a “book” and horizontal lines were etched onto the slate surface as a guide for neat handwriting.〔Peter Davies, “Writing Slates and Schooling”, Australasian Historical Archaeology, Vol. 23 (2005), 63-64.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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