656 



SUMMAKY OF CURRENT RESEARCHES RELATING TO 



pinion adjustment, and if desired an inclination joint is provided. The 

 other features are well known (fig. 123). 



Crouch's " Opsonist " Microscope.* — This instrument is shown in 

 fig. 124. The lateral position of the fine-adjustment is a special feature, 

 and has been designed to meet the wishes of those microscopists who 

 prefer the fine-adjustment at the side rather than at the back. The fine- 



FiG. 125. 



adjustment itself is on the cam and screw principle, and is executed by a 

 new micrometer movement with drum reading to • 001 mm. The coarse- 

 adjustment is by means of a diagonal rack-and-pinion. The stage has 

 vertical and cross-traversing mechanical adjustments of 1 in. and 2| in. 

 respectively, and is made removable, so that a cultivation on a plate or 



* Catalogue, Crouch's Microscopes and Accessories, S. Maw, Son & Sons, 

 London. 



