Microtomes: their Choice and Use 



233 



and perhaps more. It is, unfortunately, impossible to adjust 

 the object in any precise direction when once fixed to the 

 plain object-holder. To remedy this defect the company 

 have introduced an orientating object-holder. In this the 

 cup to which the object is fixed moves in a horizontal and 

 vertical direction by means of a ball-and-socket joint. A 

 milled-head screw and a spiral spring control the vertical 



Fig. 58.— R. akd J. 



Beck's Del^ipine Miceotome. 



movement, the horizontal movement being effected by two 

 milled nuts ; these two movements, together with that 

 obtained by rotating the object-holder, allow the object to 

 be orientated very precisely. 



Another microtome, similar in principle to those just 

 described, has been devised by Mr. Hugh McLeake, of 



