ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



545 



five shillings less to make ; but, in the author's opinion, efficiency of the 

 adjustment is sacrificed by the alteration. 



Fig. 57. 



■ Figs. 58 and 59 are drawings (not to scale) of Swift's fine-adjust- 

 ment. A is a prism-bar carrying the nosepiece, B, and is placed in a 



The triangular lever C is 



A 



box attached to the body of the Microscope. 





Fig. 58. 



Fig. 59. 



pivoted to this box, and by means of the micrometer-screw presses 

 against the little wheel and raises the prism-bar, A, against a spring 

 wound roand D. The V-grooves in the box which hold A are made 

 capable of adjustment by capstan-headed screws. 



June 19th, 1912 2 b 



