452 



ME. F. DABWIN ON THE POSITION OF 



nected with either of the grooved pulleys "W or w, by means of a 

 driving-belt of silk ; the spindle of the klinostat can be kept in 

 rotation, either at the rate of one revolution in 20 minutes, or of 

 one revolution in half an hour. 



Fig. 14. 



..th 



Kg. 14 — Elevation of the sup- 

 port, s, &c, in a plane at right 

 angles to that of fig. 13, showing 

 the mode of bearing on the fric- 

 tion-wheel. The spindle with 

 its groove, g, is seen in section. 

 Lettering as in fig. 13, with the 

 exception of h, which is the edge 

 of the hole in m, and within 

 which is seen the disk (d in 

 fig. 16) which serves to clamp 

 the spindle in any eccentric 

 position desired. 



When a plant growing in the box is fixed on the klinostat, it 

 hardly ever happens that the centre of gravity of the weight 

 coincide, with the axis of rotation, so that the clock has to work 

 unequally m different parts of the rotation ; and if this inequality 

 m the distribution of the weight is at all large, the clock stops 

 altogether. But the klinostat devised by my brother has an ar- 

 rangement by which the position of the weight can be altered 

 until its centre of gravity coincides with the axis of rotation. 



