v^v 





AY 9 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 



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



INDEX NUMBER. 



REYNOLDS & BRANSON, Ltd. 



GRAND PRIX AWARD. TURIN, 1911. 



SOLE AUTHORISED MAKERS OF 

 STROUD & RENDELL SCIENCE LANTERNS. 



The "University" Lan- 

 tern, with Russian iron 



body, sliding baseboard, two 



superior objectives, plane 



silvered mirror "A," which 



is moved by a knob causing 



the rays to be reflected 



unwards for the projection 



of objects in a horizontal 



plane, condensers 4 \ in. diam.. 



th silvered back 



be used at " C," 



erecting prism 



"D," lime-light 



e carrier. Price 



travelling case, 



:rsible adjustable 



£10 7 6 



Ditto, ditto, with "Phojnix" Arc Lamp H 15 



Reversible adjustable stage " B " for supporting apparatus, extra 7 6 



The " College " Lantern, without adjustable stage, with 



lime-light burner complete ... ... ... ... 8 2 6 



Ditto, ditto, with "Phoenix" arc lamp ... 9 10 



Slit and prism for spectrum with support, for either lantern ... 1 7 6 

 Polariser and analyser ... ... ... -.- ... ... ... 2 



Catalogues post free. 



Optical Lanterns and Accessory Apparatus, 223 pages. 



Abridged List of Chemical Apparatus and Chemicals, 44 pages. 



Mechanical Models for 



rid M Lie hi 



14 COMMERCIAL STREET, LEEDS. 



John J. Griffin & Sons, L 



KEMBLE ST., KINGSWAY 

 LONDON, W.C. 



Scientific Instrument makers. 



THE NATURALIST'S 

 FIELD-GLASS. 



The " Folding Minim " 



The GRAY-BURNSIDE 



MOTOR - GYROSTAT 



With 10 attachments for demonstrating all the pro- 

 perties and practical applications of the Gyrostat. 



Descriptive Book.',!, with Pines, on Application. 



Gyrostatic Pendulum. 



GRAY'S GYROSTATIC MODELS 



Prices on Application. 



is an ideal Binocular 

 Ready for use. f or Nature Study. It 



combines the keenest definition, extra 

 wide field, magnification of 5A, and ample 

 illumination ; yet is no larger than a cigar 

 case, and is easily carried in a pocket. 



Price, in pock.nl case, or leather sling case. £7 10 



NEGRETTI & ZAMBRA 



Holborn Viaduct, London, E.C 

 City Branch : 45 Cornhill, E.C. 

 West End : 122 Regent St., W. 



Illustrated 

 price lists of 

 'BINOCULARS' 



sent post free 

 on request. 



Ready for placing in case, or pocket. 



