434 



Acoustics. 



No. 5331.>- 



53 315 a. 1 = 20. 



53316. 1:10. 



53 317. 1 : 8. 



53320. 1:6. 



53 327. 1 : 3. 



53,315. Kundt's Dust Figure Apparatus, for showing the longitudinal vibrations of bars and *' 

 for determining the velocity of propagation of sound in air (W. D. Figs. 214 21(1 

 [200 202]), with 4 screw ciamps and 2 glass tubes 1. Hi. o 



53,315 a. --idem, Figure, the glass tube with mounts and unions without stopcock, 



in order to enable them to be filled with gases 1. Hi. o 



5.'>, .'516. -- idem, Figure, the tube with mounts and stopcocks, but without screw 



chimps 1. 14. o 



53,317. Apparatus after Quincke, Figure, for determining the Velocity of Sound by ob- 

 serving stationary vibrations; on wood stand (cf. W.' u. E. Phys. Prakt. Fig. 87), with 

 millimetre graduation on one side and plain two-colour centimetre graduation on the 



other side for measuring the length of the vibrating air column 1. s. o 



It is advisable to provide for use with the apparatus Tuning Fork No. 53,318 or 53,319. 



f>:i.:tix. 2 Suitable Tuning Forks for the above c., and c 3 (ut 4 and tit-,), on nxmancr box . Each 1.0.0 

 .">:). :)I9. idem, without resonance box, with handle Each 0.18.0 



53,320. 8 Steel Bars on one resonance box, Figure, giving the scale, with violin bow, 



for producing transverse vibrations of rods !.<>.(> 



cl. S033, 1114, 



3800, 1122, 1120. 



