What technology has shortened the exposure time of photography from a few minutes to a few tenths of a second for the first time, fast enough to run a horse?

187 1 year, British doctor Richard leach maddox (18 16- 1902) successfully replaced collodion with gelatin. He found that when gelatin emulsion containing silver bromide was prepared and coated on a glass plate while it was hot, even after drying, the chemicals would not crystallize like collodion. When washing, the emulsion will expand properly to facilitate the reaction between developer and fixer. This photography method is called silver bromide glue method or gelatin dry plate method.

This invention not only increases the exposure speed to a fraction of a second, but also greatly simplifies the photographer's work. The quality of dry printing is as good as collodion. At the same time, it has three important advantages in use: 1. You don't have to bring darkroom tents and chemicals when you go out to shoot. You can develop your own films at home or ask others to develop them for you. 2. Gelatin dry plate has a fast photosensitive speed, and the outdoor exposure time can be shortened to several tenths of a second. Photographers can shoot by hand, and tripods are no longer necessary. 3. Gelatin dry plates can be produced on a large scale, and the dry plates manufactured by the factory are more stable and have better quality than those prepared by themselves.