﻿Barton & Kilbt. 



Phil. Mag. Sw. 6, Vol. 23. PI. XIII. 



Fig. 1.— Diagrammatic plan of Experimental Arrangement* for 

 Photographing Vibrations of Violin Strings and Air. 



Fig. 2.— Right Sound Hole covered with 

 White Paper and Dark Membrane. 



■in. 3.— Diagram of Rocking Mirror, 



Stalk ami Membrane. 





4.— Hocking Miniii.it mocnteh "S Hem. v. 



