No. 53459. 



Sound Figures. Resonance Phenomena. 



443 



53 453. 1 : 6. 



53454. 1:9. 



53 456. 1 : 7. 



53455. 1:1-2. 



53458. 1:10. 



53459. 1:8. 



s. d. 

 5.5,450. Triangular Paper Membrane for preceding, length of side 30 cm 0. 6. 



53, 151. 3 Small Paper Membranes, round, rectangular and triangular, for preceding ... 0.10.0 



53,452. Powder Spray, Figure, for powdering the colour figure discs 0. 5. 



With the aid of the above the discs can be coated quite evenly with lycopodium. 



5.3,453. Apparatus for showing the Vibration of Liquid Films, Figure, with three metal 



plates of round, rectangular, and triangular aperture 1. 2. 



53.454. Glass Bell on wood base, Figure, for showing the nodes 0. 4. 



The bell is filled with water and when sounded shows the vibration-nodes by a rippling of the liquid. 



53.455. Glass Bell with 4 Pendulums in contact with its periphery, Figure, on stand . 1. 4. 



Resonance Phenomena. Organs of Human Speech and Hearing. 



* 53,456. 2 Tuning Forks, one with small pendulum, Figure, on resonance box, c t =256 

 (ut 3 = 512 v. s.), for showing the resonance of this tuning fork when the other, of the 

 same pitch, is struck (Ztschr. f. d. phys. u. chem. U. 7, 1894, p. 272) ! 2. 12. 



53.457. Cylindrical Glass, 1 m high, for showing resonance (M. P. 9 lh Edn. I, Fig. 663) . . 0. 8. 



The cylindrical glass is filled with water to such height that the air column above corresponds to a 

 tuning fork set into vibration and held over a glass; use can be made, say, of a, (ut :) ). 



53.458. Resonance Apparatus after Savart, Figure (M. P. I, Fig. 638 [665]) 2. 4. 



The glass bell is made to sound by stroking with a violin bow and the resonator tube (in two parts) 

 is varied until resonance takes place. 



53.459. Resonance Apparatus after Drenteln, Figure, consisting of a tall glass cylinder, 

 forming the source of sound, a lamp glass, closed on one side, as resonator, a brass tube 



for blowing the cylinder and a small lamp (Ztschr. f. d. phys. u. chem. U. 7, 1894, p. 273) 0. 6. 



By blowing aside cork dust or lycopodium. spread on the inner edge of the glass resonator, or by 

 blowing out the lamp, resonance is shown, when the cylindrical glass is blown with the blowing tube, after 

 its tone is timed to the tone of the resonator by filling with water. 



* Can be used with the Pro- 

 jection A]>i>aratu>. 



Resonators for Sound Analysis, etc. 

 see p. 449 451. 



Cl. 6031, 5792, 4974, 

 6000, 1046, 5859. 



