On 7 April 1859, Belgian civil engineer and inventor Henri Désiré du Mont filed a Belgian patent for nine different versions of his Omniscope, of which most would show stereoscopic animation from stroboscopic discs or from cylinders with pictures on the outside. One version was built inside a peep-box and had a lens focusing a light-beam to project the image on a frosted glass screen. Another design combined two zoetropes with Wheatstone's reflecting stereoscope in between. On 2 May 1861, while working near Paris, he filed French patent 49,520 for "a photographic device for reproduction of the successive phases of movement". It would transport 10 or 12 photographic plates, one by one, from a slotted frame, past the camera lens, into a lower receptacle area. A moving shutter was synchronized to ensure the plates were only exposed when they were in the right place. In January 1862, DuMont explained his motives and ambitions in a demonstration for the Société Française de Photographie, stating that photographers already knew how to photograph subjects in motion, such as a galloping horse, but showed no interest in recording multiple images. He believed that series of successive images were much more interesting because of the harmony in lines and shadows, and because the captured poses of people would be much more natural. He therefore developed his patented stereoscopic and stroboscopic viewing apparatus and a camera that could capture the successive phases of movements with intervals of only fractions of seconds. He would attach the resulting images to the circumference of a cylindrical or prismatic drum, optionally bound together on a strip of fabric.