■"' "A 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

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



OPTICAL PROJECTION APPARATUS 



for all classes of 



EDUCATIONAL WORK. 



NEWTON & CO., 



Opticians to H.M. the King. 

 72 WIGMORE STREET, LONDON, W.l. 



SCIENTIFIC INSTRUMENT MANUFACTURERS 

 and LABORATORY FURNISHERS. 



RESISTANCE BOX 



MT5.CROSS STREET HATTON GARDEN LONDONECr 



REYNOLDS & BRANSON, Ltd. 



Chemical and Scientific Instrument Makers to His Majesty's 

 Government (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 made 



to customers' own Designs. 



CATALOGUES POST FREE. 

 Enquiries for Technical Chemicals in quantity solicited. 



14 COMMERCIAL STREET, LEEDS. 

 HIGH RANGE 



THERMOMETERS 



Of Guaranteed Accuracy. 



NATIONAL PHYSICAL LABORATORY 



Certificate of N. & Z. Thermometer No. D 10520. 



Heading. Correction. 



212 F. F. 



300 



400 



500 +1 



600 +1 



700 



80S 



Above is a Copy of Certificate of a Thermometer 

 recently verified. 



%GRETTI © ZAMBRA 



38, HOI BORN VIADUCT EC I. 

 LONDON. 



