Auxiliary Apparatus for Whirling Tables. 



283 



52021. 1:5. 



52025. 1 : 10. 



52017. 1:9. 



52028. 1:8. 



52030. 1:9. 



52.015. Apparatus (Eisenlohr's) for showing that the rotation of the plane of oscillation of s d 

 Foucault's pendulum is proportional to the sine, of the geographical latitude: for placing 



on the whirling table (W. D., Fig. 95 [88]) 1. 5.0 



52.016. Pendulum Ball, painted half black and half yellow, for proving the conservation of 

 the plane of oscillation, Foucault's experiment (W. D., p. 117 [108]), for hanging on 



the lower end of the axis of the whirling table 0. 1.6 



52.017. Pendulum for Foucault's Experiment, Figure, with stage and suspension clip . 1. 0.0 



52.018. 5 Stroboscopic Discs, with black and coloured moving images 0. 6.0 



52.019. Stroboscopic Cylinder (Quincke's) with 1 set paper strips, for demonstrating pendulum 

 oscillations, longitudinal and transverse oscillations, vibrations of ether particles, the 

 reflection of cord undulations, vibrations of strings and air strata in pipes, the vibrations 



of liquid particles and of successive transverse waves 0. 14. 



52.020. Strips alone 0. 6.0 



52.021. Siren-Disc, of metal, with 4 rows of holes, giving the major chord when blown, 



F i g u r e, without' whirling table 0. 5. 



52.022. - - idem, w'th 8 rows of holes, giving the major or minor common chord, or, if 

 specially desired, the chromatic scale , 0. 7. 



52.023. - - idem, with 4 rows of holes pierced obliquely 0. 9. 



52.024. Wave Siren-Disc (Konig's), in disc form . . . 0.15.0 



A wave line, formed by the algebraic addition of 4 sine curves, receives a current of air from a 

 slotted aperture, the air being made to vibrate as if 4 tones were sounded simultaneously. The human 

 ear then separates this compound form of vibration into its constituents in such manner that prima, 

 third, fifth and octave are separately heard. 



51', 025. Wave Siren-Disc (Konig's), large pattern, of brass, Figure, in various tone ranges 



Each 3. 6.0 



52.026. Siren-Disc (Oppelt's) 0.16.0 



52.027. Siren-Disc (Appunn's) 3. 6.0 



For complete data regarding siren-discs, see Acoustics Section. 



52.028. Savart's Toothed Wheels, 4 wheels mounted on one axis, giving a chord. Wheels 



of zinc, Figure 0. 9. 



52.029. - - idem, with brass wheels 0.12.0 



52.030. Apparatus for proving Doppler's principle, Figure, as suggested by van Gulik 

 (Ztschr. f. d. phys. u. chem. U., 14, p. 288), without whirling table 0.13.0 





C'l. 1051 1, 659, 



5390, 5724, 4963. 



