To pages 278 and 279. 



Whirling Tables. 



The manipulation of the Whirling Table fitted with electric motor has been found to be most 

 advantageous since the experimenter has both his hands free and does not require to remain in t he 

 immediate neighbourhood of the machine in order to explain the phenomena being demonstrated, 

 but can even go to the blackboard. 



The arrangement of this machine presents the further advantage that the motor can be used. 

 without removing it from the stand, for driving the influence machine or other apparatus, and this 

 at any speeds. Fig. 8051/60435 shews an influence machine being driven. 



The Whirling Table fitted with motor drive is manufactured in two sizes: Fig. No. S!C>1 

 shews the smaller pattern, which is sufficient for most experiments. 



Whirling Tables with D. C. Electric Motor Drive, Figs. 8951 A and B and 8951/60 435; small Pattern, 

 with electric motor, compound wheel gearing, regulating resistance, switch, plug contact and 

 J metres flexible. Qf Hp ^ 1/g ^ 1/g 



Pressure, Volts 110 110 220 220 



List No. 8951 8952 8953 8954 



With D. C. Motor 



With D. C. Motor 



Price, 7.0.0 8.0.0 7.10.0 8.10.0 



If the pressure is different from above the prices are varied accordingly. 



Large Whirling Tables with D. C. Electric Motor Drive, with electric motor, compound wheel gearing, 

 regulating resistance, switch, plug contact and 2 m flexible, for connecting up to Direct Current. 



Of HP Vl6 V. Vl6 Vg 



Pressure, Volts 110 110 220 220 



List No. 8961 8962 8963 8964 



Price, 8. 0. 9. 0. 8. 10. 9. 10. 



The prices are proportionately changed when the pressure varies. 



B. For Alternating and Three-phase Current. 



From the point of view of construction the Whirling Tables having Alternating Current 

 Motors do not differ in any way from those for Direct Current. The special nature of the A. ( . 

 motors does not, however, allow quite such a wide degree of variation in speed as the D. C. motor. 

 For this reason and, more especially, because in the case of the A. C. motors, the power decreases 

 with diminution in speed, it is desirable to give the preference to a Whirling Table with D. C. motor 



in all cases in which Direct Current is available or 



can be easily provided. 



8951/60435. 1:12. 



8965. 1 : 8. 



Fig. 8965 shews a Whirling Table driven by Alternating Current. The speed can be varied 

 from about 80 1000 r. p. m. 



On three-phase networks A. C. motors arc also used, being connected up to one phase only. 



This is permitted by most electricity works in view of the low efficiency of the motor in question. 



Whirling Tables with A. C motor drive, Fig. 8965; small Pattern, with electric motor, compound 



wheel gearing, regulating resistance, switch, plug contact and 2 metres flexible, for connecting up 



to an A.C. network or to one phase of a three-phase supply. 



Wit li A. C. Motor, i Of HP Vio Vio 



Frequency 50 I Pressure, Volts 110 



(100 pole alternations List No. 8965 8966 



per second) Price, 9. 10. 10. 0. 



Large Whirling Tables with A. C. Motor Drive, with electric motor, compound wheel gearing, regulating 

 resistance, switch, plug contact and 2 metres flexible, for connecting up to an A. C. network 

 or to one phase of a three-phase supply. 



With A. C. Motor 

 Frequency 50 



( 100 pole alternations 

 per second) 



Of HP V 10 



Pressure, Volts 110 



I^l No. 8967 



Price, 1 10. 10. 



220 



8968 



11. 0. 



C'l. 11229, 11227. 



