280 



Whirling Tables and Accessory Apparatus. 



No. :.i HO 



51 972. 1 : 8. 



51977. 1:10. 



51978. 1:7. 



51979. 1:10. 



51.970. Counting Mechanism, Figure, fitted to the preceding whirling tables; after every s. <l 

 100 revs, this device rings a bell O.ir.d 



The above prise only holds good when the counter is ordered at the sano timo as the whirling 

 table. If required afterwards, the price is increased. 



51.971. Tachometer, Fig. 51,962, fitted to the whirling table; this instruments always 



shows the momentary r. p. m 6.15.0 



51.972. Electric Motor, Figure, rotating on base with floor stand, with attachment for 

 using it as a whirling table; with cord pulley for driving stirrjcrs, electrolytic stands, 



etc, For 110 volt D. C., 1 / a HP 7. O.o 



51.973. -- idem, for 220 volt D. C 7. 5.0 



Prices quoted on application for other kinds of current and voltages. 



51.974. -- idem, with belt pulley instead of the cord pulley Extra 0. 5.0 



51.975. Centrifugal Apparatus, Figure, for showing: (1) that the centrifugal force increases 

 with the speed of rotation, and that it is greater with the same speed and with large 

 radius of rotation than with small; (2) that the centrifugal force at Ihe same speed is 

 greater the smaller the radius of rotation (W. D., Fig. 82 B [75 B]; Fr. phys. Techn. I. 



2, Fig. 3219) 0. 1S.O 



5 1 .976. 2 Cylinders of Wood and Cork, in iron frame, Figure (W. P., Fig. 76), Double-star 

 Apparatus 0- '' u 



51.977. 2 Brass Balls, Figure, whose masses are as 1 : 2, in iron frame (Fr. phys. Techn. 



I, 2, Fig. 3216) 0. 7.o 



51.978. Cup and Ball (August's): (llass cup with balls of e<|iial diameter but different weights. 

 Figure (W. I)., p. 101 [93]; Fr. phys. Techn. I, 2, Fig. 3220; M. T., p. 71) ... 0. !.( 



51.979. _ i <i e ,,,, w ith semi-circular trough, F i g u r e (\V. I)., p. 101 |93|; Fr. phys. Techn. 



I, 2, Fig. 3221) 0. 7.0 



('/. 5101, 5384, 537, 



:.TIL>. 3:!I7, 



4lis7, i:!2. :>71*. 



