298 



Mechanics of Solids (Statics and Dynamics). 



52 128. 1 : 5. 



52 129. 1 : 4. 



52.128. Apparatus for Foucault's Pendulum Experiment, Figure... 



The 10 cm diameter iron ball, weighing about 4 kg, is suspended from an iron plate by means 

 of a fine steel wire. By unscrewing a milled screw this ball can be removed from the wire. The 

 centre of gravity of the ball is determined in mercury. The sheet metal disc is covered with sand 

 during the experiment. In ordering, please state length of suspension wire desired. 



52.129. -- idem (Weinhold's), Figure (W. D., Figs. 9698 [8991]) 4. 5.0 



The accurately turned, cast iron ball, 10 cm in diameter and weighing 4 kg, is fastened to a 

 steel Cardanic suspension by means of a fine steel wire. This ball swings over a paper-covered metal 

 disc which can be raised by a lever. A brush, filled with coloured glycerine, and inserted in the ball, 

 leaves a coloured line behind only when the plate is raised. 



s. d. 

 2.10.0 



52,130. - - idem, with 20 cm diameter ball, weighing 30 kg, suitable for lofty rooms . 



* 52,131. Apparatus (Edelmann's) for Foucault's Pendulum Experiment, for objective pro- 

 jection, Figure (Wied. Ann., 45, 1892, p. 187), with device for projecting . . . 

 A magnet is inserted in the pendulum underneath. When the pendulum is swinging the niii.nnei 

 swings over a soft-iron knife-edge fitted on the rotary vertical axis. By magnetic attraction this knife- 

 edge is always brought into the predominating plane of the pendulum. 



9.10. (I 



52,132. Projection Device, separately 



5.10.0 



52.133. Contact Device, Figure, for the balls used in the Foucault pendulum experiment, 

 as suggested by Weinhold (W. D., 4 th Edn., Fig. 99; Ztschr. f. d. phys. u. chem. U., 



17, 1904, p. 198), with stand .......................... 1. 



Contact is effected by the internal friction of a liquid (coloured water). 



52.134. Haiti's Model for explaining Foucault's Gyroscope (Pendulum) Experiment (Fr. pli\>. 

 Techn. I, 2, Fig. 3259) ............................. 



52.135. Torsion Pendulum with Accessories, as suggested by Friedr. C. G. Miiller, comprising 

 an iron rod and a circular disc with clamp (M. T., Fig. 52), with lead weights inserted. 

 with 4 suspension wires of 3 different materials 



52.136. U-Tube for oscillations of liquids (M. T., Fig. 49) 0. 



52.137. Apparatus for demonstrating and explaining the harmonically Oscillating Motion of 

 the projection of a point moved in the circle on a straight line, as suggested 1>,\ \\eiler, 

 Figure (Ztschr. f. d. phys. u. chem. U., 20, 1907, p. 105) L. 



If the handle on the back of the disc is turned the hurmoiiie motion e;m be followed. 



0.0 



o.o 



0.0 

 8.0 



lli.H 



Can be used with (lie Projector. 



For Apparatus for Foucault's Pendulum Experiment, suitable for the 

 Whirling Table, see Nos. 52,015-52,017, p. 283. 



;. c 



