During this period he invented numerous instruments—the sphymograph, cardiograph, pneumograph, thermograph, and odograph—with which he made invaluable contributions to scientific knowledge. It was Konig's work which attracted Marey to animated photography, as a handmaid of science, the outcome being his greatest discovery, which he named chronophotography. Marey was much impressed by Jannsen's astronomical revolver with which, in 1873, a series of photographs of the transit of Venus were taken in 70 seconds. This caused him to build a photographic gun, with which gulls in flight were secured. The work of Muybridge, the English investigator residing in San Francisco, aroused his enthusiasm to the highest pitch, and enabled him to perfect his system of taking a series of successive photographs upon a single glass plate. Finally, in 1893, he produced his first moving-picture camera working with celluloid films.
But some twenty years before this last achievement he had conceived the idea for an International Institution where experiments of this character, in connection with motion photography, might be carried out to the advantage of the sciences. He realised that the elucidation of physiological phenomena was quite beyond the capacity of a single individual. He outlined his scheme at the Fourth Physiological Congress, held at Cambridge (England) in the early seventies, while Monsieur H. Kronecker, of Switzerland, a great admirer of Marey's work, who succeeded to the presidential chair of the Institution after the founder's death, urged a similar plea at an exhibition of scientific apparatus held in London in 1876.
By permission of the Motograph Co.
A Novel "Hide" contrived by Mr. J. T. Newman with Camera Fifteen Feet above the Ground.
The working platform is covered with boughs so as not to alarm the forest life being cinematographed.
By permission of the Motograph Co.
The "Hide" opened to show Working Platform, Trestle Support, Operator and Camera placed Fifteen Feet above the Ground.