No. 51998. 



Whirling Tables and Accessory Apparatus. 



281 



51 993. 1 : 8. 



51983. 1:6. 



51 987. 1 : 



51 996. 1 : 6. 



51 997. 1 : 6. 



51.980. Whirling Apparatus with 8 Spherical Pendulums, for showing that the centrifugal force <1 

 increases with speed of rotation, and is higher when the radius of rotation is large than 



when small, the time of run being the same in both cases 0.10.0 



51.981. Pendulum Race (Puchs'), with double-cord pendulums of various lengths, the balls 

 of which are always raised to the same height (Ztschr. f. d. phys. u. chem. U., 16, 1903, 



p. 343; Fr. phys. Techn. I, 2, Fig. 3222) . 0.10.0 



51,98-'. Watt's Pendulum, Figure (W. D., p. 101 [93]) 0.11.0 



51.983. Watt's Ball Governor, with a complete throttle flap valve, in section, Figure 



(M. T., p. 71) 1. 8.0 



51.984. Angle Lever Apparatus (Fr. phys. Techn. I, 2, Fig. 3203 [I, Fig. 426]) 0.16.6 



51.985. Spring Balance, for showing the strength of centrifugal force, Figure (Fr. phys. 

 Techn. I, 2, Fig. 3200) 0. 15. 



51.986. - - idem, Hartl's, for measuring the centrifugal force (Ztschr. f. d. phys. u. chem. 



V., 10, 1897, p. 123; Fr. phys. Techn. I, 2, Fig. 3204) 2.10.0 



51.987. Centrifugal Balance, Figure 0.18.0 



. 1 ,988. - - idem (Friedr. C. G. Miiller's) (M. T., Fig. 39), with variable centrifugal mass 



and rule for measuring the radius of swing 1.12.0 



51.989. Emery Disc for hardness tests: can also be used for grinding small tools (M. T., p. 51) 0. 6.0 



51.990. Flattening Ring, Figure (W. D., p. 102 [93]) 0. 7.0 



51.991. Sphere of Glycerine Clay, with suspension (W. D., Fig. 84 [77]; M. T., p. 71) . . 0. 6.0 



51.992. Apparatus for showing the oblateness of a sphere of oil and Saturn's ring .... 1. 0. 



This apparatus is well adapted for showing the flattening of plastic rotating bodies. 



51 .993. Glass Vessel for Mercury and Coloured Water, Figure (Fr. phys. Techn., 6 lh Edn., 



I, Fig. 546; M. T., p. 70) 0. 4.0 



51.994. Glass Balloon for hanging on the lower end of the axis 0. 4.0 



Tiie vessel is filled with water and closed with a sheet of cardboard, the air-pressure preventing 

 its escape. On rotating the balloon the cardboard can be taken away without any of the water escaping. 



51.995. Cylindrical Attachment, with rule: can be used as a tachometer (M. T., p. 69) . . - 0. 5. it 



51.996. Angle with 2 obliquely placed tubes for mercury and coloured water, Figure (Fr. 



phys. Techn., 6 th Edn., I, Fig. 545; M. T., p. 70) 0. 7. 6 



51.997. Siphon, with marking rings, Figure (M. T., Fig. 41) j 0. 9.0 



51,99*. Attachment with 3 disconnected tubes (M. T., Fig. 42) 0.12.0 



CI. 5731, 5729. .'.325. 



65u', 4961, 5728, 57J2. 



