A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



"To the solid ground 

 Of Nature trusts the mini which builds for aye." — Wordsworth 



No. 519, Vol. 20] 



THURSDAY, OCTOBER 9, 1879 



[Price Sixpence 



Registered as a Newspaper at the General Post Office.] 



[All Rights are Reserved. 



BROWNING'S ELECTEIC LANTERNS. 



SCREEN SPECTRUM APPARATUS. 



JOHN BROWNING begs to inform Spectroscopists that he has just 

 introduced a new metal body ELECTRIC LANTERN, with an Electric 

 Regulator .specially adapted to the same, for showing Diagrams, and ex- 

 hibiting Spectra on a Screen ; thoroughly efficient in action, and yet 

 economical in price. 



The Automatic Regulator is of the best construction, exactly similar 

 to his now well-known large Regulator, but arranged to burn with a 

 smaller number of cells. 



Price of the Electric Lantern for medium size Lamp, with metal 

 body, japanned bronze green, with two nozzles, interchange- 

 able — one for showing diagrams, with 3 1 -inch condensers, 

 the other for spectrum analysis Jg7 10 



MEDIUM SIZE AUTOMATIC ELECTRIC LAMP. 



This Lamp works well with from 20 to 30 pint Grove's Cells, or 



the same number of quart Bunsen's jB7 10 



Illustrated Catalogue of Spectrosctpes, Price 6d, 



HOW TO WORK WITH THE SPECTROSCOPE. By JOHN BROWNING. 

 Price IS. bd. 



LIS TS OF PRICES SENT FR EE. 



JOHN BROWNING, 



OPTICAL AND PHYSICAL INSTRUMENT MAKER TO H.M. GOVERNMENT, THE ROYAL SOCIETY, THE 



ROYAL OliSF.KVATOKY OF GREENWICH, AND THE OBSERVATORIES OF KEW, CAMBRIDGE, 



MELKOURNE, THE U.S. NAVAL OBSERVATORY, CAMBRIDGE AND HARVARD 



UNIVERSITIES, HOBOKEN COLLEGE, &c., &c. 



63, STB AND, W.C. 



FACTORY— SOUTHAMPTON STREET, LONDON, W.C. 



