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When filming in time-Iapse with low picture frequencies it is advantageous to work with an impuls method of operation, i. e. to switch in the camera for only a small proportion of the total time. The length of the exposure and the picture-frequency should be able to be regulated as independantly as possible from one another. The author discusses the possibilities given in this field and describes a suitable apparatus for the purpose.
The author examines different methods to avoid moisture condensation on observation windows caused by irregular temperature distribution. The respective measures consist of covering the window with a water-absorbent layer and heating with electrical current or through absorption of radiation. Furthermore, the culture-medium can be fixed in suitable cases on the observation window, through which photographs can be taken.