Home Movies (1944)

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HOME MOVIES FOR JULY Hydraulic Interval Tinier For Time-Lapse Filming... p, ERCEPTIVE movement of light in a scene or rapid growth in plants and flowers makes for the dramatic, and stimulates interest. A pastoral view may be pretty but if the change in lighting, as the sun passes from the east to the west, is compressed into a few seconds, the view will come to life. The opening of a bud into a flower, the emergence of a butterfly from a cocoon or rapid microcinematography of mould growth, etc., also become intriguing when time is speeded up. However, even when visible movement is present, interest cannot remain By DALE R . fixed and scene lengths must be limited to between 6 and 30 seconds, depending on the detail involved in the picture of the most pleasing results. Lapsed time scenes varying from closeups of seed sprouting, through medium and long shots of plants filling the frame in growing, to vivid closeups of flowers opening can be combined to produce intriguing sequences of complete film length. This type of photography has the advantage in these days of rationing of keeping the camera busy with a slow expenditure of film even to the extent of requiring a whole summer to expose 100 feet. The serious amateur eventually yearns for some type of interval timer for his movie camera that will enable him to experiment with lapsed time photography. Of course, if one is patient and • Photo above shows interval timer coupled with camera for eiposing film at predetermined intervals in the time-lapse photography of growth of flowers, plants, etc. Wiring diagram for the timer appears below. As indicated by sketch, minute stream of water fills bucket, causing it to fall and empty its contents, thus causing electrical contacts to be made that turn on lights and set camera in motion. S I M 0 N S 0 N has plenty of time on his hands, an assistant, a dark room timer or watch, and a camera with single frame release, this type of photography can be accomplished manually; but that is the hard way. After investigating numerous methods for operation of interval timers, including mechanical and electrical clocks, motors and gear trains, friction drives, as well as electric eye and other electronic devices, it was decided that hydraulic operation was the simplest to construct and permitted the widest choice of time adjustments. It is assumed that the reader owns a camera with single frame release device or can add such a release. Previous issues cf Home Movies have given detailed methods for converting some of the most popular models of movie cameras for single frame action. The pressure required to operate the release should be measured as well as the movement required, since this indicates the maximum power necessary from a solenoid (if used) or from the hydraulic timer about to be described when connected direct. The principle of operation of a successful hydraulic timer is illustrated in CAMERA WIRING DIAGRAM FOR INTERVAL TIMER PHOT0FLO0P WATER ISOO TURNS OF + 14 ENAMELED COPPER WIRE ON A Iti DIP." FIBER TUBE CAMERA RELEASE SOLENOID (if u»eo) I 10 VOLT 60 CYCLE FIG. 1 278