A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



To the solid ground 



T>J E -W T O PJ SiE, CO'S 



LONG-RANGE 

 ELECTRIC 

 LANTERN. 



Single Long-range Lantern, brassfront with 4lin.condens 

 ind evtra large front lenses ^ in. in diameter. Complete wiih ihe 

 ' New Universal" Hand-feed Arc Lamp in case, £22. 



NEWTON & CO., 72 Wigmore Street, London, W. 



Established over 200 Years. 'I elegtams :" Newlobar, London." [ 



By Post 



STUDY 



THB LENS 



It is the Key to Success in Photography. 



Who can expect to e.xcel who does not understand 

 how to use the diaphragm, the swing back, the 

 rising front, focu=;sing scale, &c., &c. ? All .such 

 (juesiions are lucidl)' and simply explained in 



" PHOTOGRAPHIC LENSES : 



A SIMPLE TREATISE." 



350 pages, 44 ]>lates, numerous diagram-; aT'l 

 illustrations, cloth bound. 



R. & J. BECK, Ltd., l«oS2^^«i.^^: 



GRAND PRIX, TURIN, 1911. 



SOLE .ALITH(;RISEr) MAKERS OF 



STROUD & RENDELL SCIENCE LANTERNS. 



The "University "" Lan- 

 tern, wiih Russian iron 

 body, sliding baseboard, two 

 superior objectives, plane 

 silvered mirror "A," which 

 is moved by a knob causing 

 ihe rays to be reflected 

 upwards for the projection 

 of objects in a horizontal 

 plane, condensers 4?,- in. diam., 

 prism with silvered back 

 which can be used at "C," 

 or as an erecting prism 

 in mount "D,' hme-light 

 burner, slide carrier. Price 



withou- reversible adjustable 



table " B, • £9 10 



10 17 6 



7 6 



7 12 6 



9 



1 7 6 



2 



D tto ditto with Pho-nix Arc Lamp 



Reversible adju table table B for supporting apparatu 

 The " College ' Lantern, without adjustable table, with 

 lime-light burner complete 



Ditto, ditto, with " Phcenix " arc lamp 



,'^lit and prism for spectrum with support, for either lantern ... 

 Polariser and analyser ... 



Catalogues post free. 

 Optical Lanterns and Accessory Apparatus. 223 pagi 

 Abridged List of Chemicai Apparatus and Chemicals, 44 

 Mechanical Models for teaching Building and Machi 



14 coiviivin:FcciA.i^ stke:e:t, iLie:e:x>s 



NEGRETTI & ZAMBRA'S 

 "Hyetograph" 



is a Recording 

 Rain Gauge dis- 

 tinguished by its 

 simplicity ; and 

 low price £6 15 



Illililralcd PriiC. I.isl 

 Recording and other Ra 

 Ganges sent post fn 



38 HOLBORN VIADUCT, E.C 



45 CORNHILL, E.C, 



122 RECENT ST., W 



LONDON. 



