Tops, Pendulum. 



293 



52 094. 1 : 5. 





52 095 B. 1:4. 



52099. 1:16. 



52 098. 1 : 10. 



52.093. Polygonal Pendulum (Gruey's), Figure, in cavdanic suspension, with frame (Fr. 

 phys. Techn. I, 2, Fig. 3384) 



If the top is wound up and the pendulum rotated out of the vertical, the point of the pendulum 

 describes a stellate, spherical polygon; if the top is not rotating, the pendulum swings as an ordinary 

 pendulum. 



52.094. Conical Pendulum (Gruey's), Figure, with frame . 



The suspension of the top, of rubber, is twisted a number of times and the top released in a 

 vertical position without any jar. The pendulum then describes a gradually widening cone, which 

 again becomes narrow until the suspension cord is twisted in a vertical position in the opposite direction 

 and a reverse motion of the pendulum takes place, etc. 



52.095. Top Apparatus (Wanka's), Figs. A and B, with stand, for setting up and with 

 special clip device for suspending the top (Ztschr. f. d. phys. u. chem. U., 11, 1898, 

 P- 235) 



Each top can be fixed in the three main positions perpendicular to each other. 



52,096. Alternating Gyroscopic Tree (Gruey's) (Fr. phys. Techn. I, 2, Fig. 3250) 



52.097. - - idem, the top being rotated by its own weight instead of by rubber cords . 



52.098. Pendulum Stand, Figure, light wood frame, with 3 brass balls and 1 wood ball, 



on single cords 



52,099. --idem, of iron, Figure, with 6 pendulums on double threads, on massive 



base, with adjustable swivels for the cords 



Two pendulums with discs hanging in different planes, 2 with bobs, each 900 mm long, and 

 2 shorter, viz., 400 and 100 mm long respectively. 



s. d. 

 3.10.0 



2.10.0 



2.14.0 



5. 0.0 



5. 0.0 



0.15.0 



0.18.0 



Cl. 33 U, 3945, 

 4Kf>3, 17, 616. 



