Petrological Microscopes 



In a variety of models, from that of simple design 



for elementary work to that of the most 



complete for the highest research work. 



STAND VI M, FOR BEGINNERS. 



With foot, pillar, and limb cast in one piece, and 

 lacquered black. Coarse adjustment by rack 

 and pmion movement ; without fine adjustment. 

 Condenser and polarizer raised and lowered by 

 side screw, and change from convergent to parallel 

 light is made by quarter turn of milled head 

 at side. Revolving stage divided into whole 

 degrees. Centring screws for objectives. Analyser 

 and Bertrand lens. Objectives, 1^, f, and 

 ^ mches. Eye-piece x 6, with cross lines ; eye- 

 piece X 8, with micrometer scale. Selenite and 

 mica films. Complete, in mahogany case, 



i£ll 



Catalogue B (Petrological and Metallurgical Microscopes) 

 free on request. 



MICRO-POLARIZING APPARATUS 



A New Apparatus for Demonstration and Projection. 

 Detailed description post free on application. 



18 BLOOMSBURY SQUARE, W.C. 



(A few doors from the British Museum.) 



