By Beverly Wilgus and Ann Longmore-Etheridge
Early in the practice of the photography, ghostlike images appeared on daguerreotypes, ambrotypes, and tintypes. The explanation for them was not supernatural: Because of the need for long exposures, in some cases of more than a minute, anything that moved whilst the camera lens was open went either unrecorded or appeared transparent in the final product. In 1856, Sir David Brewster (1781-1868), an important figure in photography’s evolution, described in his book The Stereoscope: Its History, Theory, and Construction the method by which amusing extras could be created in photographs. Brewster advised that sitters should be posed and after the majority of the plate exposure was finished, a new person should move into the scene and stay for the final seconds. This would result in a “spirit” presence.
Whilst Brewster clearly promoted this method for what it was—a trick—others with an interest in the expanding religion of Spiritualism saw ghost images as proof of life after death. It should be noted that the Victorians were not the only folk taken in by the callow exploitation of technology they did not fully understand.