ScientificAmerican1915-04-10.jpg Scientific American 1904-07-16ThumbnailsScientific American 1915-04-24Scientific American 1904-07-16ThumbnailsScientific American 1915-04-24Scientific American 1904-07-16ThumbnailsScientific American 1915-04-24Scientific American 1904-07-16ThumbnailsScientific American 1915-04-24Scientific American 1904-07-16ThumbnailsScientific American 1915-04-24
The Aeroscope at the Panama-Pacific Exposition.