J257 

 Sunwiary. 



Electrolytic phenomena have been observed with the molybdenite 

 detector and the ironpyiites detector; the E. M . F. of polarisation is 

 the cause of the difference of current intensity by reversal of applied 

 E. M. F. 



The characteristic curves for these detectors were compared with 

 those of other crystal detectors and of the electrolytic detector. From 

 the similar shapes of the characteristics it has been concluded that 

 with all the crystal detectors examined, though no products of elec- 

 trolysis are visible, the unidirectional resistance is to be attributed to 

 electrolytic polarisation in a moistened- or a gasfilm adhering to the 

 surface. 



The resistance of most of the crystal detectors employed in wireless 

 telegrapy is less than it is usually thought, and as a rule does not 

 exceed 100 Ohms. 



