ScientificAmerican1875-09-11.jpg Scientific American 1875-09-04ThumbnailsScientific American 1875-09-18Scientific American 1875-09-04ThumbnailsScientific American 1875-09-18Scientific American 1875-09-04ThumbnailsScientific American 1875-09-18Scientific American 1875-09-04ThumbnailsScientific American 1875-09-18Scientific American 1875-09-04ThumbnailsScientific American 1875-09-18

Centennial horticultural building, Philadelphia, Pennsylvania, now being built for the 1876 Centennial exposition. Also: Flechet's solar chronometer.