i:;x 



Transactions of the Society. 



ment is effected, as in John Marshall's Microscope, by sliding the 

 body up or down the pillar to a line numbered with the same 

 number as that of the power used, and for a fine- adjustment thu 

 stage is actuated by a screw at the foot of the pillar. Adams' 

 Microscope had a rotating wheel of six powers. * This wheel was 



Fig. 26. 



very large ; it had six spokes ; the powers were set at the end of the 

 spokes, the upright pillar being the axis upon which this wheel 

 rotated. 



Now, if we return to Watkins' Microscope, some improvements 

 of first importance will be found, the principal one of which is the 

 introduction of an inclinable limb to carry the body, stage, and 



*"The first rotating T nosepiece was designed by Le pere Cherubin d'Orleans, 

 capucin, (Francois Laserre), 1681. 



