292 



Mechanics of Solids (Statics and Dynamics). 



No. Bans:,. 



52 086. 1 : 7. 



52 089. 1 : 6. 



52 088. 1 : 3. 



52 092. 1 : 8. 



52 093. 1 : 5. 



52,085. Curve Top (Koppe's) (Ztschr. f. d. phys. u. chem. U., 4, 1890, p. 80; Fr. phys. Techn. 

 I, 2, Fig. 3244) 



52.086. Fessel's Top, Figure, with 1 ring (Fr. phys. Techn. I, 2, Fig. 3239) 



52.087. - - idem, with 2 rings 



I s. d. 

 2.10.0 



2. 0.0 

 2.10.0 



52.088. Bohnenberger's Apparatus, with excess weight, for explaining the conservation of 

 the plane of rotation, with stand, Figure (Fr. phys. Techn. I, 2, Fig. 3243; M. P. I, 

 Fig. 319) 



If the disc is set into rapid rotation, the axis of rotation preserves its position in space, even 

 if the apparatus is moved in any manner by raising and turning the base. 

 If required to act as a Fessel top, the ring must be firmly fixed. 



52.089. - - idem, improved by Poggendorff (Eisenlohr, Fig. 78), Figure, with device 

 for driving 



52.090. - - i <1 < in, for the whirling table, see No. 52,009, p. 282 



52.091. Top, as suggested by Schliek (Skutsch's model) (Ztschr. d. V. d. I., 52, 1908, p. 464) 



52.092. Polytrope (Sire's), Figure, for combining a number of rotations (Fr. phys. Techn. 

 I, 2, Fig. 3254) 



The apparatus has a spur drive and allows of demonstrating the following: 1) That the axe> 

 of rotation endeavour to take a parallel position. 2) That the rotations always take place in the 

 same direction, thus showing: (a) the determination of meridian, (b) the determination of the iri ii^ra- 

 phical latitude of any pl.i -e. (c) the invariability of the plane of rotation, (d) the earl h's own rotation, 

 (e) the conical motion of the earth: the nocturnal equation, nutation, (f) parallel progressive motion 

 of the earth's axis in space. 



1. 8.0 



3. 0.0 



i 



1. 7.0 



Trice 

 on appli- 

 cation. 



12. 0.0 



