152 



SUMMARY OF CUTIRENT RESEARCHES RELATING TO 



in the clamp in which it is fixed (figs. 29 and 31). The carrier is pulled 

 forwards by the action of a roller fixed eccentrically to the axis of 

 the large fly-wheel, and connected with it by the link and cords 

 shown in fig. 29. It is drawn back again by the strong spring shown 

 on the left. The extent of its motion is regulated so that the 



Fig. do. 



surface of the imbedding mass just clears the razor when the carrier is 

 at its maximum and minimum distance from eitlier end of the frame. 

 The cylindrical vessel which holds the imbedding mass and object 



is slipped into a tube or 

 Fig. 31. socket, in a cross-piece attached 



to two quadrants, arranged so 

 that the socket may be set at 

 any angle desired, and clamped 

 by the vertical screw under- 

 neath (see fig. 30). This 

 arrangement is for use when 

 the object has not been sym- 

 metrically imbedded. For a 

 rough adjustment of the object 

 to the level of the knife the 

 socket can be slipped up or 

 down in the cross-piece. For 

 more acchrate, yet still rapid, 

 adjustment the entire object- 

 holder may be raised and 

 lowered by the large micro- 

 meter screw. To this screw is attached a ratchet wheel with clicks, 

 which are controlled by the lower, horizontal, screw (fig. 30), and by 

 means of which the object is raised automatically. When the clicks 



