



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



<l To the solid ground 

 Of Nature trusts the mind which builds for aye." — Wordsworth. 



No. 2751, Vol. iio] 



Registered as a Newspaper at the Ge 



SATURDAY, JULY 23, 1922 [Price One Shilling 



! Post Office,] 



(All Rights Reserved. 



BALANCES & WEIGHTS 



SPECTROMETERS 



Particulars and Prices on application to— 



JOHN J. GRIFFIN & SONS, L™ 



Kemble Street, Kingsway, 

 London, W.C.2. 



REYNOLDS & BRANSON, Ltd. 



nical 

 Qc 



id Scientific Instrument Makers to His Majesty's 

 ernment (Home and Overseas Dominions). 



LABORATORY FURNISHERS and MANUFACTURING CHEMISTS. 



WORKS AND OTHER 



LABORATORIES 



equipped 



with Benches, Fume 



Chambers, Apparatus, 



Balances, 



Chemicals, etc. 



Designs and quotations 



submitted on application 



BRITISH - MADE Glass, Porcelain, 

 Nickel Ware, and Filter Papers. 



Apparatus in Glass, Metal, or Wood rgade 

 to customers' own Designs. 



CATALOGUES POST FREE. 



Enquiries for Technical Chen 



itity solicited. 



14 COMMERCIAL STREET, LEEDS 



h o crro a y 



BINOCULARS 



We have over 40 different Prism 

 models, and many second-hand pat- 

 terns in stock. Ask for price list 

 "B.N.," or for a selection on approval. 



%GRETTI © ZaMBRA 



38.HOLBORN VIADUCT E.C.I. 

 LONDON. 



