ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



885 



directly upon the body e but is separated from it by a small ball, 

 around which it can be moved to the desired inclination, by means of 

 three screws /. In order to lessen the friction of the carrier on 

 the slide-ways, its under surface is fitted with four ivory points g, 

 inserted as near the corners as possible, and in order to balance the 

 resistance produced by the pressure of the springs, both ends are fitted 

 with two small rollers h. 



The uncertain results produced by machines worked by hand, 

 and in which the slide-ways must be lubricated, are avoided by means 

 of the following arrangement : a catgut band i runs from one end 

 of the carrier over four rollers &, k 2 k 3 (k 4 ) to the other. k 2 is fitted with 

 a winch handle I, by which it is easily turned. The catgut band is 



Fig. 182. 



not fastened directly to the carrier but to a wire, passing through the 

 lower part thereof and fastened to it by a screw y. 



The object-carrier is very similar to that first used by Jung. A 

 short metal tube z is fastened by means of a binding-screw to the 

 inner of the two frames. The inner frame turns about a transverse 

 axis which has its bearing in the outer frame, and this latter turns 

 round a longitudinal axis and the bearings are in the carrier. The 

 ordinary complicated manoeuvres for putting the object into a proper 

 position, are in this machine effected by the turning of an endless 

 screw. In each frame is a circular disc, or rather a section of one, 

 o o' fig. 182, along the edge of which a female screw-thread runs. 

 Against this worm works a short sovewpp' which is braced up by a 



