This camera was designed for the study of high speed motions; i.e., the
flight of birds, recoil of guns, the impact of shell on plate, muscular
activity of athletes, airplane behavior, mechanical motions, etc.
The normal rate of exposures is 1,000 to 3,000 pictures per second
(4,000 pictures per second have been made).
It uses standard motion picture super-speed negative film. Prints from
these negatives are made in any standard motion picture printer, and
developed in the usual way.
The prints may then be projected in any standard motion picture
projecting machine, giving an apparent reduction of 100 to 200 times in
the speed of movement of the object photographed, and therefore easily
studied.
The camera is fitted with 48 Zeiss Tessar lenses, F-3.5 and 2″ focus,
and is driven by an automobile starting motor.
It weighs approximately 100 pounds, and therefore easily moved from
place to place. (Weight of two 6-volt automobile batteries additional.)
Sunshine is adequate for illumination. If artificial illumination is
employed, it should be equal to sunshine.
(NOTE: The explanation of the unusual speed possible with this camera
lies in its lens system, for each lens may work as much as 150 per cent
of the time; that is, the exposures overlap.)
[Illustration: [Photographs]]