V 



if-LfCTi 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



'* To the solid ground 

 Of Nature trusts the mind which builds for aye.^^ — Wordswor'IH. 



UNIVERSAL science'' lantern! BROWNING'S SPECTROSCOPES 



Complete for Slides, Microscopic Objects, and Spectra. 



Price £18. 



For Lecturers on Light, Colour, and Colour Photography. &C. 



Sole Makers: NEWTON & CO., 3 FLEET STREET, LONDON. 



:b -big 



NEW 



MICROSCOPE 



Tin. 



"BRITISH STUDENTS." 



Microscope Stand No. 55. as 

 figured, with One Bye-piece ; 

 Double Nose-piece. Two Object- 

 glasses. 2 3' and 1 8'. adjusted 

 to be in about focus, and the 

 whole packed in polished 

 Mahogany Case. 



£6:8:6 



R. Sc J. BECK, Lta., 



68 CORNHILL, LONDON, E.G. 



THE MINIATURE SPECTROSCOPE. 



This instrument will show many of Fraunhofer's lines, the 

 bright lines of the metals and gases, and the absorption bands in 

 coloured gases, crystals, or liquids. 



Price, with Plain Slit, £\ 2s. ; ditto, with Adjustable Slit in 

 Morocco Case, £i 14J. ; ditto, with Achromatic Lens, &c., 

 in Morocco Case, £2 6s. 



Illustrated Catalogue of Spectroscopes, Post Free. 



JOHN BROlVN I N G, 



MANUFACTURING OPTICIAN, 



63 STRAND, LONDON, W.C. 



THE TOURISTS ANEROID. 



(WHITESIDE-COOK'S.) 



For Measuring Altitudes without Calculation. 



New Illustrated Price Lists Free by Post. 



Made only by 



NEGRETTI & ZAMBRA, 



SCIENTIFIC INSTRUMENT MAKERS to THE QUEEN, 



38 HOLBORN VIADUCT, E.G. 



Sff/)/»C//fS; 45 CORNHILL; 122 REGENT STREET. 



NEGRETTI & Z.\MKK.\ S ■• Illustrated Catalogue, ' 603 Pages, 



12CO Eiisravings, Price v. <xi. 



Telephone : No. 6583. Telegraphic .\dtiress : " NeoBETTI, London." 



