LEAVES WITH KEGABD TO LIGHT. 

 Fig. 15. 



453 



This arrangement is shown in section in 

 fig. 16. The end of the spindle k termi- 

 nates in a screw sc, which passes through 

 the boss c and the disk-shaped plate d to 

 which d is united. As long as the end of 

 the spindle does not press against the 

 brass plate n, the disk (carrying with it the 

 spindle) can slide about in any direction 

 parallel to n in a cylindrical cavity sp 

 sunk in the wooden plate pi, of which the 

 floor is formed by a brass plate n, and the 

 roof by the plate m. The latter plate is 

 firmly attached at its circumference to the 

 wooden disk pi, and is pierced in the centre 

 by the hole h h. The edges of this hole 

 (h h) will thus limit the amount of sliding 



Fig. 15. — Elevation of 

 the support,s',&c.inthe 

 plane at right angles to 

 fig. 13, to show the pul- 

 leys (W, w), the clock, 

 and driving-cord. Let- 

 tering as in fig. 13. 



Fig. 16. 



