172 



KLINOSTAT. 



[CH. VII 



The mechanism is shown in fig. 36. The end of the 

 spindle k terminates in a screw sc, which passes through 

 the boss c and the disc-shaped plate d to which the boss 

 is united. As long as the end of the spindle does not 

 press against the brass plate n, the disc (and spindle with 

 it) can slide in any direction parallel to w in a cylindrical 

 cavity sp sunk in the wood plate pi, of which the floor is 

 formed by n, and the roof by the brass plate m. The 

 latter plate is attached to the wooden plate pi, and is 

 pierced by the hole hh. The edges of this hole limit the 

 amount of eccentric movement of the spindle. If the 

 screw sc is made to project through the disc and press 

 against n, the disc is forced against m and the spindle is 

 secured in an eccentric position. 



To get the weight to balance about the spindle the 

 following is the best plan. The screw sc is loosened enough 

 to allow the disc d to be moved by 

 the application of force, but not 

 enough to allow it to slip by the 

 weight of the plant. The plant is 

 allowed to take up its natural posi- 

 tion, which will be with its heavier 

 side downwards : the box is then lifted 

 by a hand placed under it, until the 

 spindle no longer touches the friction 

 wheel, and the boss c (fig. 35) is struck 

 vertically from above with a hammer. 

 The spindle having been thus displaced 'c ' d f ^^ th 

 iu the right direction, is replaced on Linnean Sociely'B 

 the friction wheel and its state of Journal, 1880. 



