The Tinfoil Grating Detector for Electric Waves. 



By 



T. IYIizuno, Rigakushi. 

 Professor of Physics, First Higher School. 



§ 1. In a paper,* which not long since I communicated to 

 this Journal, I suggested, that the change of the resistance of the 

 grating might be due to a mechanical effect exerted upon it by 

 impinging trains of electric waves. In other words, electric waves 

 might give impulses to some of the strips of the grating in such a 

 way as to let leaflets on their margins come in contact with one 

 another, thereby causing a diminution of resistance. In order to 

 confirm this view, further inquiries were carried out soon after the 

 communication of the above mentioned paper. 



§ 2. Having constructed about forty gratings and. tested their 

 action, I found to my surprise that while some were extremely 

 sensitive, others were not, being even utterly indifferent to the im- 

 pulses of electric waves, although they had all been prepared with the 

 same care and apparently with the same success. 



This led me to undertake a closer examination of such gratings, 

 which gave results that throw much light upon their nature. But 

 before these results can be stated, it is necessary to describe in detail 

 my way of preparing the gratings, because upon that their sensibility 

 wholly depends. 



* Note on Tinfoil Grating as a Detector for Electric Waves, Vol. IX, Pt. 1, 18U5. 



