BAKERS STUDENTS. 



87 



The square bar, together with the arm and niicroscope- 

 tube, is moved by the larger milled-heads, and a more 



Fig. 43. — Baker's No. 1 Compound Micrvsmpz. 



delicate adjustment of this optical part is effected by the 

 smaller milled-head seen behind the body. This milled- 

 head is graduated, affording a means of measuring the 



