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March, 1951
wkston: film in research
89
degree of specular reflection is permissible, and is often essential, to make good use of the available light, whereas such reflections are usually avoided in normal photographic work.
B. The camera runs slower than the projector. The converse of high-speed photography is time-lapse work, in which case the camera is run less quickly than the projector. It appears that Marey was again the original
of a local generator, and this equipment is expensive and does not eliminate the risk of a complete power failure.
8. Invisible Radiations
The use of invisible radiations is at present restricted to a small number of highly specialised fields, but the results obtained are of considerable importance. A number of workers have used infra-red radiation, and
Fig. 5.
The Apparatus of the late Dr. Canti now at Cambridge.
worker in this field. He accelerated and synthesised the slow movements of the starfish by making separate exposures at intervals of one minute.
The technique is of great value for research, but one of the major difficulties of workers in this country is the instability of the public supply mains, as voltage variations interfere seriously with lighting during protracted runs. The only solution to this problem appears to be automatic stabilising
kine-radiography has been practised for many years. More recently, ultra-violet radiation has been used for the study of living cells, but no films have yet been made with ultra-violet. It remains to be seen if this is a practical possibility or whether the radiation will kill the cells.
In all this work, very special equipment is necessary, and the economic factor has had a limiting effect on the amount of work that can be undertaken, but one looks for