Auxiliary Apparatus for Whirling Table, Moment of Inertia. 



289 



R'Scmf -J ( ' ?i)Gw.Og. 



I* --2dm. i Gew.735g. 



2'icni. 



52 069. 1 : 5. 



52 070 A. 1:17. 



* 32cm. - * 



(|Antriebgew.50g. 

 52 070 B. 1 : 12. 



52071. 1:15. 





52.067. Model of Pacinotti-Gramme Machine, Figure, as suggested by Pfaundler (M. P., 

 9 th Edn., Ill, Fig. 659 and 660), for the whirling table, with device for rendering visible 

 the lines of force; this apparatus can be recommended for explaining the dynamo. Price, 

 without whirling table 



The following pertain to the apparatus: an iron armature with winding, an iron armature, un- 

 wound, a wood armature with winding, and a frame with paper stretched across for demonstrating 

 the lines of force. 



52.068. Model of a Short-circuited Armature in the Magnetic Field, Figure, Friedr. C. 

 G. Miiller's (M. T., Fig. 222), for setting on the whirling table, with a squirrel-cage rotor 

 which can be used either with or without an iron core 



52.069. Rotating Thermocouple, Figure, cylindrical form, of iron and German silver, 

 with contact spring sliding along the cylinder 



When the apparatus is rotated the cylinder becomes heated by the friction of the spring, thus 

 producing a current which flows from the iron to the German silver according to the position of the 

 spring. 



52.070. Apparatus for determining the Moment of Inertia, Hartl's, Figs. A and B (Ztschr. 

 f. d. phys. u. chem. U., 6, 1892, p. 74, and 5, 1891, p. 76) 



The test pieces (rings, discs, bars, rectangular plate) the moment of inertia of which it is desired 

 to determine can be fixed to a spoke-cross. The release is electro-magnetic. Given in with the 

 apparatus are 6 test pieces, 2 falling weights, 1 Morse key and leads. 



52.071. Moment of Inertia Apparatus (Kurz'), Figure (M. P. I, Figs. 291, 292 [280, 281]), 

 with cords, 2 loading weights each of J / 2 kg and 2 kg, and an excess weight of 50 g; 

 apparatus 2 m high 



For Apparatus for demonstrating the laws of continuity and 

 of inertia, see also p. 251. 



s. d. 



6.10.0 



2.10.0 

 0.15.0 



9. 0.0 



3. 10. 



Cl. 4684, 



680. 602, 603, 3896. 



19 



