588 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
objectives are accurately fitted on the revolver, adjustment is obtained 
by the micrometer-screw. 
Fig. 102. 
c 
Messter’s Preparation Microscope.* — In this class of simple Micro- 
scope, which seems intended for dissection or preliminary selection, the 
image of the object always presents itself in its natural relations. Hence 
* Messter’s Catalogue, p. 37, No. 16. 
