Friese-Greene Prestwich 60mm cine projector

Friese-Greene-Prestwich double cinematograph projector, 1896, for 2 3/8 inch film

This double projector for film 2.375 inches wide is the result of a collaboration between William Friese-Greene (1855-1921) and the engineer J A Prestwich. They claimed that it removed flicker and that projection speeds could be reduced below 16 pictures per second without losing the moving effect. The shutters are arranged so that the screen is always illuminated from one or other of the two apertures, so one picture dissolves into the next. The idea for the projector was probably due to Friese-Greene who had shown moving pictures some years earlier. The mechanical details, such as the epicycle intermittent motion, are due to Prestwich.