648 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



an attachment base for the substage, and a shelf and centre for the stage 

 attachment. 



The casting of the stage base-plate is continued backwards, so as to 



Fig. 86. 



Pig. 87. 



form two cheeks (see fig. 87), which embrace either side of the limb. 

 These cheeks are then screwed to the limb, and the axis-bolt, on which 

 the instrument is inclined, passes through the whole. 



