‘The first artificially-created human clones date back to the 1860s. Clever photographers, ever on the watch for new ideas to boost business, developed several techniques to duplicate people — causing them to appear twice in the same photograph. Special plate-holders and rotating partial lens caps were among the devices used to expose half of the negative at a time. After the first exposure, the subject of the photograph would quickly move into a different position so the second half of the picture could be made.’
- The American Museum of Photography
Great stuff. Number 6 is the actor Richard Mansfield, of course. http://en.wikipedia.org/wiki/Richard_Mansfield