ZOOLOGY AND BOTANY, MICROSCOPY, KTC. 



489 



MICROSCOPY. 



A. Instruments, Accessories, &c* 

 (1) Stands. 



Zeiss' Large Mechanical Stage.t— This stage (fig. 54) has a range 

 of 50 mm. (2 in.) in one direction, and 35 mm. (If in.) in the other ; 



^b 



Fig. 54. 



vernier scales record the variations in either direction. A third vernier 

 scale enables the portions of the movable cheek-piece which secures the 

 object-slide to be recorded. This arrangement facilitates the use of the 

 apparatus as a " finder," while the process of centring is much simplified 

 by the use of a centring glass, i.e. a slide with a cross ruled on it. 



Zeiss' Stand for Crystallographic and Petrographic Work.f — This 

 instrument (fig. 55) is an example of a medium sized stand, and is so 



* This subdivision contains (1) Stands; (2) Eye-pieces and Objectives; (3) 

 Illuminating and other Apparatus ; (4) Photomicrography ; (5) Microscopical 

 Optics and Manipulation ; (6) Miscellaneous. 



t Carl Zeiss' Catalogue of Microscopes and Microscopical Accessories, 33rd ed 

 1906, p. 36 (fig. 14). % Tom. cit., pp. 50-1 (fig. 22). 



Aug. 15th, 1906 2 k 



