JAMES SWIFT & SON I™.- 



Makers of the Highest Grade 



MICROSCOPES and ACCESSORIES 



Contractors to all Scientific Departments of H.M. Government. 



ILLUSTRATED DESCRIPTIVE CATALOGUES 



OP 



Petrologica! Microscopes 



giving specifications of various models, 



AND 



Penological Accessories 



and Instruments for Mineralogy and Crystal- 

 lography, including Bel Tactometers, Gonio- 

 meters, Recording M crometers, etc., 



will be sent post free on request. 



University Optical Works 

 81 TOTTENHAM COURT ROAD, LONDON, W.I. 



leit'z 



PETROLOCICAL 

 MICROSCOPES 



STAND IIIM (illustrated) in- 

 clinable, with rotating stage divi- 

 ded in degrees, coarse and fine 

 adjustments, Bert rand lens, tube 

 analyser, substage consisting of 

 Nicol prism and condenser with 

 high-power swing-out component 

 focnssed by rack and pinion, ob- 

 jective clutch with two centring 

 collars, objectives 1" or §", and i", 

 eye-piece with cross lines, complete 

 in cabinet, £28 5s. Od. 



Catalogue of Petrological Micro- 

 scopes (47 POL) post free. 



OGILVY & CO. 



(British Agents for E. Leitz 



18 BLOOMSBURY SQUARE. 

 LONDON, W.C.I, 



