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1849 admire after american british collection corliss dedcated demonstrations drive dynamos education educational electricity engine engineer engineering engines entrance exhibits explosions factories featuring fitted floor four galleries game generate george henry inside interior invented island large light line london mechanical mills modern museum named ncorliss object objects patented people popular power provide providence really rhode rooms rotary science shafting showcases space stationary steam technique technology technologynexplosions the timing tourists traditional travel typically used valve valves variable visitors wellcome