To this end Marey devised an interesting type of clock. It consisted of a dial provided with one large revolving hand which was driven by ordinary clockwork. The face of the dial was marked off into twenty equal divisions, each of which corresponded to one-twentieth part of a second. This "chronoscope" as it was called, was placed near the object under cinematographic study, so that both the movement of the clock-hand and that of the object were photographed simultaneously. This system of timing motions it may be pointed out has been revived in a similar form by Mr. Frank Gilbreth in connection with "micro-motion" study described in another chapter.
By courtesy of the Marey Institute.
Marey's Apparatus for taking Moving-pictures of Rapid Movements.
(For explanation see [p. 112].)
By courtesy of the Marey Institute.
Cinematographing Rapid Movements.
The complete beat of a pigeon's wing secured by Dr. Marey in eighteen pictures, and taken, according to the "chronoscope" in the corner, in 3/20ths of a second.