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. 



Catalogue B (Petrological and Metallurgical Microscopes) 

 free on request. 



POLARIZING PROJECTION APPARATUS 



Particulars on application. 



18 BLOOMSBURY SQUARE, W.C. 



(A few doors from the British Museum). 



