ScientificAmerican1917-05-05.jpg Scientific American 1917-04-28ThumbnailsScientific American 1917-05-12Scientific American 1917-04-28ThumbnailsScientific American 1917-05-12Scientific American 1917-04-28ThumbnailsScientific American 1917-05-12Scientific American 1917-04-28ThumbnailsScientific American 1917-05-12Scientific American 1917-04-28ThumbnailsScientific American 1917-05-12

Directing a motion-picture battle scene by telephone.