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158 Opinion on Camera and Film Patent.
1 The camera apparatus of M. Marey, described in the
Scientific American of June, 1882, and used by him, mounted in a photographic gun, to produce a series of instantaneous photographs showing the successive phases of motion of birds and animals, describes a single-lens camera, and clock mechanism which actuates the several parts. The apparatus is shown in detail by woodcuts. M. Marey conceived the idea of equipping a gun with the apparatus from the astronomical revolver invented by Mr. Janssen for observing the last passage of Venus. He describes the apparatus as follows :
2
"The barrel of this gun is a tube containing a photographic objective. At the back end of this, firmly affixed to the butt, there is a wide, cylindrical breech piece, in which there is contained a clockwork, whose barrel is seen externally at B. When the trigger of the gun is pulled, the wheelwork begins its movement, and gives the various parts of the instrument the motion necessary. A central axis, making twelve revolutions per second,
«j controls all the parts of the apparatus. First, there
is an opaque, metallic disk, containing a narrow slit. This forms the cut-off or shutter, and allows the light emanating from the objective to enter only twelve times per second, and every time during l-720th of a second. Behind this disk, and revolving freely on the same axis, there is another one which is provided with twelve openings, and behind this is placed the sensitive plate of circular or octagonal form. The disk must revolve in au intermittent manner, so as to stop twelve times per
4 second opposite the fascicle of light that enters the
instrument. This motion is obtained by means of an eccentric, E, which is placed on the axis, gives a regular to and from motion to a rod provided with a click, C, which at every oscillation engages with one of the teeth that collectively form a crown on the disk containing the apertures. A special shutter, O, cuts off all entrance of light into the instrument as soon as the twelve images have been obtained. There are other arrangements for the