ZOOLOGY AND BOTANY, MI0R0800PY, ETC. 



633 



the general features of the construction are sufficiently obvious from the 

 foregoing. The main speciality of the instrument consists in the two axes, 



Fig. 155. 



Fig. 156. 



so that it can be placed in any position, vertical, horizontal, inclined, 

 " reversed vertical " for chemical purposes, and laterally oblique. 



Figs, are given in the specification representing the Microscope con- 

 verted into a chemical, photographic, and solar Microscope. 



Binocular Microscopes. — Of these, several different forms are described. 



Fig. 156 "represents a binocular Microscope, with a mode of producing 

 a variable separation of the tubes, and having a single object-glass ; adjust- 

 ment of the focus is effected by means of the screw collar E'. The tubes 

 T are after crossing again united at their lower extremities by two hinges, 

 and may be separated at their upper extremity by means of the reversely 

 threaded screw at q. The two prisms pp which divide the rays coming from 

 1887. 2 T 



