Abstract
The author followed up the momentary change of the photoelectric effect of tin and copper in the atmosphere by means of the autho's photoelectron counter with changeable cathode, in one atmospheric pressure. The author observed that the threshold wave length of tin is longer than 5600Å. Substances which have been discovered till now to have the photoelectric effect by long visible rays, are alkali metals and alkali earth metals, but these metals can not exist in the air. Threfore, the reason why the threshold wave length of tin by the author's experiment is far longer than that by other investigators', is the extremely high sensitivity of the author's apparatus and not impurity of test objects. Adsorpion or absorption of gas and oxydation of a metal surface may cause the change of the photoelectric effect, but further investigation must be performed for dicision in this case.
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