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16-MM CAMERAS AND ACCESSORIES 349
The mechanism release lever 'D' is pivoted about point 'E' so that an extension to this lever, arranged to project through the camera body, may be moved in either of two directions. When pressure is applied in the direction indicated at 'F' lever 'D' will rotate in an anticlockwise direction about point 'E' and so will permit disc 'A' to rotate continuously and until such time as lever 'D' is returned once more to the central or 'stop' position as shown in the figure. When pressure is applied in direction 'G' lever 'D' will rotate about point 'E' in a clockwise direction so that shoulder 'C will again be disengaged from pin 'B\ However, shoulder 'H' is so positioned above shoulder 'C that it will pass over the path described by pin 'B' at the same instant as shoulder 'C moves away from that path. Because of this pin 'B' will only be permitted to make one revolution before it is brought to rest once more, this time by shoulder 'H\ On returning the release lever to the central position pin 'B' will fall from the position it occupied when arrested by shoulder 'H' to that which is shown in the figure.
With most cameras which are fitted with single frame release mechanisms it will be found that the spring motor is unable to gain sufficient momentum during a single revolution to produce an exposure as short as that which normally occurs when the mechanism is running continuously. It is therefore usual practice to close the lens diaphragm by one 'stop' or, reduce the shutter opening to 50 % of that normally employed in those cameras fitted with a variable aperture shutter in order to compensate for this change in exposure time.
The field which is opened to the operator by the inclusion of this refinement in the camera mechanism is only limited by the ingenuity of the person concerned. Although it is true that many of the effects which can be produced call for a considerable degree of patience and careful planning if first-class results are to be achieved, such requirements are only likely to be a disadvantage to industrial film producers who are making 16-mm films as a commercial proposition and, therefore, can ill afford the time which must be devoted to such work. For example, the path taken by a work piece through a complicated mechanism or series of operations might appear quite meaningless if shown as a complete line on a diagram representing the various operations. By using the single frame exposure technique it is possible to show the growth of such a line as it passes through the various stages and, if required, to animate the mechanism to indicate certain functions which may occur as the line progresses from one point to the next.