No. 52051. 



Auxiliary Apparatus for Whirling Tables. 



285 



52 047. l : 0. 



52 050. 1 : 5. 



52 049. 1 : 8. 



52,041. Screen of Bristol Board, graduated, Fig. A, and with 2 sliders, F i g. B, on adjust- 

 able stand 



2,042. - - idem, without stand 



52.043. Oscillating Prism, Fig. 51,949 B, p. 278, for mixing the spectrum tints (M. P., 

 8 th Edn., 11,1, Fig. 137), the prism being 60x30 mm. Price, without whirling table 



2,044. --idem, 70 x35 mm 



52,045. Glass Globe with a solution of Glycerine and Soap (as suggested by Eisenlohr), Figure 

 (Fr. phys. Techn., 6 th Edn., II, p. 788), for demonstrating Newton's rings of thin 

 liquid films 



The glass glote should be slightly warmed before the experiment is made until large soap films 

 form when it is shaken. One of these films is introduced into the upper half of the glass vessel so 

 that it is vertical to the axis; if now the globe is carefully rotated by means of the whirling table 

 the film referred to shows the colour rings in a very beautiful manner. 



512.046. Phosphoroscope (Becquerel's), Figure (M. P., 9 th Edn., 11,1, Fig. 257), with stand 

 and universal clamp for firmly fixing the various bodies 



5L'.i47. Polarisation Apparatus, Figure, for demonstrating the properties of polarised 

 light, for the whirling table (M. P., II, 1, Fig. 671 [634]) 



512.048. Apparatus for boiling by friction water, alcohol or ether (W. D., Fig. 417 [393]) . 



512.049. - - idem, wnth arrangement for igniting the vapour of the alcohol, Figure . 



512.050. Apparatus (Puluj's) for determining the mechanical equivalent of heat, Figure, 

 with a thermometer divided in 1 / 10 and a screw clamp with pulley, for setting on the 

 whirling table (W. D., Figs. 418421 [394397]) 



The inner cone is completely insulated by ivory rings. The apparatus is constructed in a thorough 

 manner, and the experiment can be made with great accuracy. 



s. d. 

 0. 9.6 



0. 4.6 



1. 5.0 

 1.10.0 



0. 7.0 



2,051. - - idem, with Whirling Table 



2. 0.0 



1.10.0 

 0. 5.0 

 0. 6.0 



5. 5.0 



7. 0.0 



Cl. 5321, 667, 668. 



