A New Apparatus for Recording Ecological and Climatological Factors, especially Temperatures, over Long Periods.

A new type of apparatus for recording temperatures over long periods has been constructed. A photographic plate is subjected to radioactive radiation, and the illuminated spot is moved as a function of temperature. If the apparatus is placed under varying temperatures one may after a certain period develop the photographic plate. By photometer measurements the temperatures that occurred during the registration period are found, and the duration of each temperature interval is given. The same principle may be used, with slight modifications, also for recording other factors than temperature. [ABSTRACT FROM AUTHOR]