C. BAKER'S MODEL 



2O3 



by fixed milled heads, and all fittings are sprung and have adjusting 

 screws to compensate for wear, and fine adjustment by Campbell diffe- 

 rential screw which Mr. Baker adopted for these microscopes in 1888. 



FIG. 165. C. Baker's Model (1895J. 



Swift and Son formerly made two instruments of the first class, 

 one having a bar movement similar to that of Andrew Ross, the 

 other a Lister similar to Beck's. The principal difference was that 

 the foot was of the ' bent claw ' form. We have already seen that 



