i8 On Radiant Matter. 



spokes of the wheel carrying wide mica paddles. At each 

 end of the tube, and rather above the centre, is an aluminium 

 pole, so that whichever pole is made negative the stream of 

 Radiant Matter darts from it along the tube, and striking 

 the upper vanes of the little paddle-wheel causes it to turn 

 round and travel along the railway. By reversing the poles 

 I can arrest the wheel and send it the reverse way, and if I 

 gently incline the tube the force of impact is observed to be 

 sufficient even to drive the wheel up-hill. 



This experiment therefore shows that the molecular 

 stream from the negative pole is able to move any light 

 object in front of it. 



The molecules being driven violently from the pole there 

 should be a recoil of the pole from the molecules, and by 

 arranging an apparatus so as to have the negative pole 

 movable and the body receiving the impact of the Radiant 

 Matter fixed, this recoil can be rendered sensible. In 

 appearance the apparatus (Fig. 12) is not unlike an ordinary 



FIG. 12. 



radiometer with aluminium disks for vanes, each disk coated 

 on one side with a film of mica. The fly is supported by 

 a hard steel instead of glass cup, and the needle point on 

 which it works is connected bv means of a wire with a 



