ScientificAmerican1924-11.jpg Scientific American 1904-02-06ThumbnailsScientific American 1924-12Scientific American 1904-02-06ThumbnailsScientific American 1924-12Scientific American 1904-02-06ThumbnailsScientific American 1924-12Scientific American 1904-02-06ThumbnailsScientific American 1924-12
"New scientific methods for the control of theatre lights"