1890s film viewing device — electric motor drove a sequence of images past a viewing lens. Precursor to cinema projection, individual viewer experience only.
At the end of the 19th century, there was feverish experimentation with electromechanics to make moving images visible. The electrotachyscope was one of these solutions—a motor-driven device that presented individual photographs in rapid succession. Instead of projection, the principle of a rapid-sequence viewing through an eyepiece was still used: the viewer looked into a peephole and saw the images flash by as an electric motor rotated an image drum or disc at high frequency. The speed was adjustable—the faster the rotation, the smoother the illusion of movement. The technical elegance lay in the reliability of the motor; unlike hand-cranked mechanisms, a constant speed could be maintained.
Practically, this meant for early experimenters: no complex optics like with projectors were needed, no large lenses, no elaborate lighting system. The images were often mounted on a metal disc or glued on in paper form. The device was compact, portable, and could be used decentrally—ideal for fairs, exhibitors, and private screenings. The disadvantage was obvious: only one person or a few people at a time could experience the spectacle. Those who wanted to make money had to build many machines or process long queues of spectators.
In the context of film history, the electrotachyscope was a dead end—but an instructive one. It shows how the industry tried out various technical paths before light projection (as with Lumière or Edison's Kinetoscope) prevailed. However, the basic idea—electromotive precision for image sequences—remained alive and later flowed into film transport mechanisms. Anyone who wants to understand the early history of apparatus must realize: cinema was not inevitable. It could just as easily have remained a privatized peephole experience.