ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
99 
for the purpose, so as to adapt the object-holder to slides of various 
sizes.* 
This frame together with the stops and object-slide is moved laterally 
by means of the milled head K, fixed in a slanting position towards the 
Fig. 8. 
back and controlling a rack slantingly fixed to a lower side of the 
frame. The available lateral movement measures 50 mm. The guiding 
* Screw h is to be loosened by means of a screwdriver. Messrs. Zeiss have 
intentionally used an ordinary slit-head screw, since as a rule the position of the 
stop is adjusted once for all, and changes in the position of the stop would preclude 
the use of the scale as a finder. 
