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immediately restored the receptacle to its original position where it proceeded to fill up again drop by drop. The effect of this operation was to turn the blade, and the axle to which it was attached, once, thus recording a single photograph; continuing its turn, the blade would strike the pin released by the electro-magnet and would come to a standstill with each fall of the scale as the receptacle became full of water, the operation began over again and the result was a fresh photograph taken at an interval regulated by the dropping of the water. Subsequently, the Marey Institute and other photographic studios developed slow-motion devices of a less primitive nature. In the earliest of these studios the light was obtained from the sun by simply throwing back theroof of these more or less barn-like constructions.
In slow-motion photography it is essential to have an absolutely constant source of light. Experience showed that very good photographic results of the germination and growth of plants could be obtained from the more or less constant light of the Jupiter arc-lamp. The best results so far, however, have been given by high-power demiwatt lamps. The Cultural Section of Ufa, which, under Dr Nicholas Kaufmann and with Wolfram Junghans as director and Paul Krien as camera-man, is now engaged in taking slowmotion pictures of the growth of beans for the first " Secrets of plants " talking films, has actually equipped its cultural film studio with glass of a ruby-red colour. This secures uniform intensity of light, broken from time to time by the illumination from high-power nitrogen lamps. For modern science has, of course long ago furnished slow-motion photography with sources of light that intercept automatically at exactly regular intervals. The layman may picture a modern slow-motion camera somewhat as follows.
An automatic device attached by a flexible bar to the camera, the handle of which causes it to turn once in so many seconds, minutes or hours.
The films obtained by this process are highly original. There is no love-story in them, no murders or sensational incidents of any kind. And yet, to take an example, " The Miracle of Flowers ", produced nearly six years ago now, showed that the public could never see enough of these plantfilms, which, simple though they are, have a fascinating and even exciting attraction. Every year, and in the hot weather, too, when the cinemas are generally half empty, this film exercised irresistible drawing power.
Moreover, " The Miracle of Flowers " was a propaganda film. The Badische Anilin und Soda Fabrik must be given the credit for having first demonstrated by film the beneficent properties of nitrogen as a fertilizer.
In order to take these pictures, the Works employed slow-motion cameras of the type mentioned above. The preliminary work alone occupied years. To quote a few figures, 2237 separate exposures, spread over 87 days, were required for the filming of maize fertilisation. The germination and blossoming of tobacco necessitated 5306 pictures distributed over 105 days.
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