T- 



RIO L913 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



John J. Griffin & Sons, L T 



KEMBLE ST., KINGSWAY, 

 LONDON, W.C. 



Scientific Instrument makers. 



The GRAY-BURNSIDE 



MOTOR - GYROSTAT 



With 10 attachments for demonstrating all the pro- 

 perties and practical applications ot the Gyrostat. 



D, Hptiv, Booklet, with Prices, on Application. 



Gyrostatic Pendulum. 

 GRAY'S GYROSTATIC MODELS 



Prices on Application. 





REYNOLDS & BRANSON, Ltd , 



Chemical and Scientific Instrument Makers to His Majesty's 



Government (Indian, Home, and Colonial), Laboratory 



Furnishers and Manufacturing Chemists. 



"Rystos" Bench, 

 showing bottles 

 with enamelled 

 labels on each side. 



One set of bottles re- 

 quired for each four 

 Students as supplied 



CHEMICAL. PHYSICAL, and TECHNICAL LABORATORIES 

 Fully Equipped with BENCHES. FUME CHAMBERS, Ac. 



The Girls' High Schools at Barnsiey, 'Beverley, Doncaster, Leeds and 

 Nuneaton ; Radley College, Oxford ; The Schools, Shrewsbury ; Wellington 

 College, Berks ; St. Mary's College, Winchester ; th- Science Laboratories 

 at the Grammar School, Dunstable ; Laboratories at Messrs. Brunner, 

 Mond & Co., Ltd., Northwich. Cheshire ; the National Physical Labora- 

 tory, Teddington ; Transvaal Dept- of Agriculture ; (Experimental Farm), 

 South Africa ; The Technical Schools. Morley and Yeadon ; Imperial 



Service College. Windsor ; and many others. 



Catalogue ofCkemical a,,,/ Physical Apparatus ami Chemicals, 550 pp. 



and 1,500 Illustrations, post free on application. 



Designs of Benches and Fittings to suit all requirements. 



14 COMMERCIAL STREET, LEEDS. 



THE NATURALIST'S 

 FIELD-GLASS. 



The " Folding Minim " 



is an ideal Binocular 

 Ready ^ for use. f or N a t u re Study. It 



combines the keenest definition, extra 

 wide field, magnification of 5J, and ample 

 illumination ; yet is no larger than a cigar 

 case, and is easily carried in a pocket. 



NEGRETTI 5- ZAMBRA 



Holborn Viaduct, London, E.C. 

 City Branch : 45 Cornhill, E.C. 

 West End: 122 Regent St., W. 



Ready for placing in case, or pocket. 



Illustrations 

 are one-third 



The size of an ordinary cigar t 



