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electric blanket
In the United States and Canada, an electric blanket is a blanket with an integrated electrical heating device usually placed above the top bed sheet. In the United Kingdom and Commonwealth, electric blanket commonly refers to an electric underblanket (electric mattress pad), which is placed below the bottom bed sheet. Electric blankets usually have a control unit which adjusts the amount of heat the blanket produces. Blankets for larger sized beds often have separate controls for each side of the bed. The electric blanket may be used to pre-heat the bed before use or to keep the occupant warm while in bed.
Some modern "low voltage" electric blankets have thin carbon fiber wires and work on 12 to 24 volts.
==History==
The first electric blanket was invented in 1912 by American physician Sidney I. Russell. This earliest form of an electric blanket was an ‘underblanket’ under the bed that covered and heated from below. There is some dispute about when the first electric overblankets were introduced. The first recorded publication of such a unit was in 1930 by Samson United Corporation.〔("Electric Sleeping Blanket for Winter Weather" ''Popular Mechanics'', April 1930, bottom-right pg. 542 )〕 However, others claim it was later in 1937 that electric 'overblankets', which lie on top of the sleeping person, were introduced in the United States.
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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