NA TURE 



[December 30, 1922 



Laboratory Glassware 



BEAKERS, FLASKS, 

 RETORTS, etc. 



Porcelain 



CRUCIBLES AND BASINS 



Filter Papers 

 Pure Chemicals 



JOHN J. GRIFFIN & SONS, 



LIMITED, 



KEMBLE STREET, KINGSWAY, 

 LONDON, W.C.2. 



THE FERGUSON 

 SOLAR CHRONOMETER 



will show correct time without any calculation or 



allowance for equation. It is very portable (Model A 



being only 4 ins. in diameter) and it can be set up 



by anybody, no compass or level being wanted. 



/ 



BELLINGHAM-STANLEY 



Polarimeter Tubes. 



Cover Glasses. Washers. 



Cementless Jacketed Tubes for high 



temperature work. 



Mercury Lamps. 



Spectroscopic Attachments. 



Optical Trains for ultra-violet 



polarimetry. 



Full particulars from 

 BELLINGHAM Sr STANLEY Ltd. 

 71 HORNSEY RISE, 

 LONDON, N.19. 



Tel. Homsey 2270. 



V 



J 



Model A, for use between 60 N. and 60 S. . . £5 15 

 Model B, for use in any latitude £6 15 



With descriptive pamphlet. 



J. H. STEWARD, Ltd., 



Opticians and Scientific Tnsti anient Makers to the British 

 and Foreign Governments. 



406 & 457 STRAND, LONDON, W.C.2. 



Established 1852. 



— Teitz 



MICROSCOPES & ACCESSORIES 



The following NEW CATALOGUES 

 applied on application : — 



46 B— Metallurgical 



Apparatus. 



6 C — Dissecting Micro- 

 scopes and Lenses. 



47 E — Haematological 

 Apparatus. 



47 F Microtomes. 



47 Pol— Petrological 



Microscopes. 



OGILVY & CO. 



British Agents for E. Leitz, 

 18 BLOOMSBURY SQUARE, LONDON, W.C.L 



Optical and Mechanical Repairs to any make of 

 Microscopical Apparatus executed on the Premises. 



