442 



Acoustics. 



No. :>3437- 



53 441 A. 1:6. 



53438. 1:4. 



^ 



53 441 B. 1:6. 



53443 and 53 441 C. 1: 9. 



53 445. 1 : 6. 



53452. 1:3. 



53. 437. Apparatus for showing the position of the Nodes on the opposite sides of a longitudinally - 

 vibrating Horse Hair 0. 6. o 



53.438. Apparatus for Chladni's Figures, Figure, consisting of one iron clamp, one 

 rectangular and one round glass slab 28 cm diameter, in box with sand and case of 



resin (W. D. Fig. 220 [206]) 1. 2.0 



53,43!). - - idem, with two Metal Discs of 28 cm diameter or length of side respectively 1. 8. 



53.440. Black Board for No. 53,438, for showing the dust figures in air plates (W. D. 



p. 285 [258]) 0. 1.0 



53.441. Chladni's Sound Figure Disc, of metal, Figures A and B, see also Figures 

 53,443 and 43,441 C, with heavy iron base, round, rectangular or triangular, 30 cm dia- 

 meter or length of side . Each 1. i>. o 



53,153. Mirror on Stand, Figure 51,153, p. 206 (M. T. p. !>), for rendering the sound figures 



more visible 1. S. o 



.V..143. Tube with Stand for Chladni's Discs, for Ilopkins's Experiment on Resonance, 



Figure 53,443, without sound figure disc (). IS. (I 



53.444. Sound Figure Disc with Resonance Tube for Ilopkins's Kxpcriment. fitted together 



on massive base 1. Hi. o 



53.445. 2 Metal Discs of same shape, Figure, one with foot, the other with handle . . 1. 10. (I 



These plates are of the same pilch. If the one with the handle is bowed and held above the other, 

 the latter shows the same figure by resonance. 



5.".. I Hi. Brass Plate with steel mil attached for concentric nodal lines (M. 1'. I, Fig. 736 [76<>|) o. 1'J. (I 



53, 117. Square Paper Membrane, 30 cm side, on support with wind tube 1.16.0 



53. 14'.!. Round Paper Membrane of 3d cm diameter, for above o. o. o 



Cl. 1155, 1154. 1156,59111. 

 5998, 5010. 





