432 



Acoustics. 



No. 53302- 



53 302. 1 : 9. 



53 304. 1 : 6. 



53 306. 1 : 4. 



53305. 1:5. 



53 307. 1 : 4. 



53,302. Stroboscopic Disc, after Topler, with clockwork drive, Figure, for analysing oscil- 

 lating planes, on stand 



53,303. --idem, for hand drive 



s. (1. 



3. 0.0 



2. 0. 



12. (. (i 



53.304. Stroboscopic Disc, with 110 volts Direct Current Electric Motor and Tachometer, 

 Figure, with series and shunt regulator for obtaining a wide degree of regulation 



If it is necessary to have a motor for a different voltage, kindly mention this when ordering. 



53.305. Stroboscopic Disc, after Samojloff, Figure, for analysing sounds before a large 

 audience (M. P., 10 th Edn., Vol. I, Fig. 825), for use in conjunction with gas flame 

 Manometer No. 53,306, which should be used with acetylene for this experiment. Tin- 

 disc is placed on the whirling table (say, one with motor drive) and can also be used 



as a Siren Disc 0. 12. 



The acetylene is generated from calcium carbide with the aid of a Kipp Apparatus, a smal 

 gasometer being placed in front of the flame. 



53.306. Gas Flame Manometer, after Weinhold, Figure, with rubber tubing and with 

 resonator (W. D. Fig. 242 [228]) 0. 10. 



53.307. -- idem, Figure, with rotating burner and driving device, can be used without 

 rotating mirrors (W. D. Fig. 243 [229]) 1. 16. 



Cl. 3369, 3949, 861, 

 4943, 1079. 



