Note on Tinfoil Grating as a Detector for 

 Electric Waves. 



By 



T. Mizuno, Rigakushi. 



Professor of Physics, Daiichi Koto Gakko. 



flat wooden block 



1. Much interested by Herr E. Aschkinass' experiments described 

 in his paper read before the Physical Society of Berlin, 1 have been 

 induced to repeat them. How far my results confirm his and how far 

 they differ from them, will be seen from this note, in which I also give 

 a few tests of the sensibility of tinfoil grating as a detector of electric 

 waves, and an account of some experiments to determine the nature of 

 its action. 



2. I prepared my gratings by first coating 

 with tinfoil and then cutting on it a number 

 of fine parallel slits with a sharp knife (see the 

 annexed figure). 



A and B are binding screws which are 

 fixed in the block and facilitate the connection 

 of the grating with a Wheatstone's bridge. 



The particulars of the two gratings chiefly 

 used in my experiments were as follows : — 



(1). Rectangular in form, 3.5 cm. by 5.1 cm., total number 



of lines 97, and the resistance nearly 130 ohms. 

 (2). Also rectangular, 3.5 cm. by 4.4 cm., the number of 

 lines 118, and the resistance nearly 232 ohms. 

 3. My primary vibrator was a brass cylinder 3 cm. in diameter 

 and 26 cm. in length, its surface interrupted midway along its length 



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