A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ground 

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



No. 494, Vol, 19] 



THURSDAY, APRIL 17, 1879 



[Price Sixpence 



Registered as a Newspaper at the General Post Office.] 



[All Rights are Reserved. 



t 



BROWNING'S 



ACHEOMATIC 



TELESCOPES. 



Achromatic Telescope, with 4-inch object-glass of 

 the best quality, 60 inches focus, mounted on 

 Browning's improved double-jointed tripod 

 stand, having quick and slow screw motions in 

 altitude and azimuth, with three celestial eye- 

 pieces, powers 60, 150, and 200, one terrestrial 

 eye-piece and finder, the Telescope with rack 

 adjustment, packed in solid mahogany case 



£45 



This instrument was designed at the request of, and 

 was approved by, the Astronomer- Royal, Sir G. B, 

 Airy, K.C.B. 



Catalogue of Astronomical and Terrestrial 

 Telescopes sent post free. 



JOHN BROWNING, 



OPTICAL AND PHYSICAL INSTRUMENT 

 MAKER TO H.M. GOVERNMENT, THEROYAL 

 SOCIETY, THE ROYAL OBSERVATORY OF 

 GREENWICH, AND THE OBSERVATORIES 

 OF KEW, CAMBRIDGE, MELBOURNE, THE 

 U.S. NAVAL OBSERVATORY, CAMBRIDGE 

 AND HARVARD UNIVERSITIES, HOBOKEN 

 COLLEGE, &c., &C. 



63, STRAND, W.C. 



Factory — Southampton Street, London, W.C. 

 ESTABLISHED 100 YEARS. 



