Who changed the glass-based dry plate into a portable film form?

After gelatin dry printing is widely used, the exploration of improving photosensitive materials continues. People found that the gelatin dry plate based on glass was fragile and bulky, so they began to look for a material that was lighter and easier to bend than glass plate as the substrate.

1887, Hannibal Goodwin (1822 ~ 1900), an American priest and photographer, spent ten years successfully coating photographic emulsion on celluloid (a nitrocellulose plastic) sheet, thus making the glass-based dry plate easy to carry.