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584
MULLER
November
of release then this signal is fed into a time-delay box, thus closing the switch to the driving motors of the camera after a predetermined time interval which can be controlled within wide limits. This means that the cameraman does not have to be near his camera at the time the shock is administered which is important from the point of view of safety to operating personnel. If no release signal is available then the cameraman starts the time-delay mechanism manually.
After the shock has been given, the film is removed from the camera and properly marked for future identification.
115
-115
^.-EXTINGUISH
< — LIGHT *K-DARK-4
FLASH'' 1 CYCLE (± SEC. = 16.67 MS)
ARGON BULB -LIGHT SOURCE FOR FASTAX TIME
Fig. 7 — Relationship between 60-cvcle alternating voltage and flashing of timing
bulb.
So much for the picture taking. After the films have been developed, they are first examined for any unusual occurrences or to demonstrate some mysterious happenings which could not satisfactorily be explained at the time of the shock. Next comes the procuring of specific data, which in our case means the measuring of the displacement of a particular part with respect to the reference lines. To examine the film frame by frame, we use a commercially available projector called a Recordak, which will enlarge the picture approximately ten times. We first mark off that portion of the film which is to be measured and establish the time interval between two successive frames by means of the marking on the side of the film (Fig. 6). We simply establish the length of one cycle and count the number of frames (Fig. 7). The action we are interested in is usually