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Micro-Cinematographic Apparatus — Rosenherger 463
is accomplished by means of a relay which starts the driving motor. When the camera drive has completed one revolution, one exposure has been made, the machine stops automatically, and is ready for a new impulse from the clock. The length of exposure is regulated by an adjusting screw.
The motion picture camera is mounted on a slide so that it can be moved from side to side to align the tube of focus control with the optical axis of the microscope.
In order to exclude transmission of vibration, no mechanical connection exists between the microscope and the camera; a telescope tube hanging into a collar attached to the microscope eliminates the outside light and allows the projected light to come on to the film. Instead of the telescope tube an observation tube or a bellows slipped in from the front part of the camera platform, may be used.
If macroscopic pictures are to be taken a photographic lens is screwed into the face plate of the bellows and the microscope is removed. The adjustable microscope table can then be used to hold the objects to be photographed. With this arrangement, the apparatus is employed for ordinary vertical cinematography (for objects immersed in water, small animals, or animated drawings).
In order to photograph phenomena which have to be taken horizontally, for example, objects in aquariums and slow chemical reactions in test tubes, a 45 degree mirror is attached to the photographic lens.
Film records can therefore be taken without using the optical bench with the microscope.
The motor is connected by a leather belt, directly for high frequencies, or indirect^, by means of reduction gears for low frequencies including stop motion.
The distributing panel supports rheostats for the motor, for low and high intensity arc lamps, connections for foot switch and light increaser, and several additional plug receptacles. Casters under the panel permit its being moved about so as to be close to the hand of the observer at all times.
LITERATURE
1. Alfred E. Coliu, J. Hamilton Crawford, and Heinz Rosenberger, Cinematography of skin capillaries in the living human subject, Proceedhigs of the Society for Experimental Biology and Medicine, 1924, xxii, 89.