It was around this time that George Eastman had invented a machine to coat a photographic emulsion on flexible film. This was the link that made the movie camera and movie projector possible. The zoopraxiscope motion picture projector invented by Muybridge in 1879. With Edison aware of Muybridge...
Chicago's Columbian Exposition in 1893 also included a Woman's Building. A unique safety elevator invented by multi-patent holder Harriet Tracy and a device for lifting and transporting invalids invented by Sarah Sands were among the many items featured at this event. Traditionally women's under...