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ANIMATED PHOTOGRAPHY 375
Of course, it would be absolutely impossible to appreciate the details of these movements if the positives were passed through the apparatus for viewing at the same rate (15002000 per second) as that at which the negatives were obtained.
Instead of doing this, they are passed through an ordinary cinematograph projection apparatus at the rate of about fifteen per second, which as a general rule is found to be sufficiently slow to enable the movements to be easily followed.
Sometimes, however, even this is too fast, and then it is arranged that only two or three views are seen per second, but when this is done, arrangements are made to make the exposure much longer in proportion to the period of change than is usually the case, so that although the changes are made less frequently, the motion may still appear continuous.
Such developments as the above are of extreme interest to the scientific world, since by means of such apparatus it becomes possible to follow, by the aid of the camera, movements so rapid that their details escape our notice, and then reproduce these movements at a rate which can enable the student at his leisure to make observations otherwise impossible.
Of course the converse operation is also possible. A series of photographs can be prepared, which shows the changes taking place in some object, such as a developing bud, during a relatively long period of time, and then these can be reproduced through the projection apparatus at such a rate that the whole growth, which actually took days to complete, can be observed in a few minutes.
It is also possible in some cases to obtain colour films of movements, and when this becomes more generally extended and perfected, the results obtained will be even more instructive and entertaining than they are at present.