2 AKT. 10— IC. HONDA AND S. SHIMIZU: 



Wertheim" tö the conelusion th:it eaeh har vil)rated in its faiida- 

 inental mode. l">y ])assiTig an intermittent current tlirough the 

 ma^netizinsf coil, he heard a continuous sound, the pitch of which was 

 the same as that of the make or hreaiv (^f the current. The thickness 

 of the bar liad no effect on tlie pitcli of tlie sound. Xonmagnetic 

 bodies «"ave no sound under similar conditions. He then concluded 

 that the vibration of the wire was produced by the magnetic change 

 of length, lîeatson-^ noticed a sound produced in a stretched iron 

 or steel wire carrvins; an intermittent current. De la Kive'^ tried, 

 not only the bars of iron and steel, but also those of lead, zinc, 

 bismuth, tin, antimony, platinum, gold and silver. He placed these 

 bars between the poles of an electromagnet and passed an intermittent 

 current throuirh them. Thev all sounded, the ferromaiinetic metals 

 producing sound only with the intermittent current through them, 

 although there was no magnetizing held acting. The experiments 

 with fine powders of several metals and coaks gave similar result. 

 He ascribed the phenomenon to some transpositions of molecules. 

 Ferguson^'and Ader®' noticed similar phenomenon with intermittent 

 as well as alternate currents. Trowbridge®' found that nickel and 

 cobalt also produced sound under similar conditions. In studying 

 the eifect of tension imd compression t)n the intensity of sound 

 produced in iron and nickel bars, Bachmetjew'^' found that the effect 

 was parallel to that of the tension on the magnetic change of length. 

 He thus concluded that the intensity of the sound is a function of 

 the change of lengtli by magnetization. 



1) Wertheim, Pogg. Auti. ^^, 43, 1848. 



2) Beatsou. Electr. Mag. April 184G ; Arch, de Genève 2, 113, 1846. 



3) de la Rive, Phil. Trans. \, 39, 1847; Pogg. Ann. 76, 270; Arch, des Se. phys. et nat. 

 25. 311, 1866 ; Pogg. Ann. 128. 452 ; Ann. de chim. et de phys. [4] 8. 305, 1866. 



4) Ferguson, Pro. Roy. Soc , Edinb., March 6, 1878 ; Beibl. 3, 205. 



5) Ader, Couipt. rend. 88. G41, 1879 ; Beibl. 3, G42. 



6) Trowbridge, Beibl. 3, 289, 1879 ; Proc. Amer. Acad. H, Dec. 114, 1878- 



7) Bachmetjew, Exner's Kep. 26. 137, 1890 ; Beihl. 14, 537- 



