Keywords: Plateforme mobile, station du pont des Invalides.jpg View of the moving walkway at the 1900 Paris world fair The two left platforms shown here were moving at different speeds while the right one remained immobile 1900 photograph 12 x 18 5 cm Institution Brown University Library object history exhibition history credit line Published in N D Exposition universelle de 1900 album of 50 fine photographic views Paris 1900 accession number 1303845624468752 <gallery> File Paris Exposition Italian Pavilion Paris France 1900 n2 jpg </gallery> PD-old Images of Paris from the Brown University Library Exposition universelle de 1900 album of 50 fine photographic views Exposition Universelle 1900 Moving sidewalk Exposition Universelle 1900 Pavillon de l'Italie de l'Exposition Universelle 1900 |