A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ground 

 Of Nature trusts the mind which builds for ay,r."— Wordsworth 



No. 493, Vol. 19] 



THURSDAY, APRIL 10, 1879 



[Price Sixpence 



Registered as a Newspaper at the General Post Office.] 



[All Rights are Reserved. 



BROVVNING'S 



AOHEOMATIO TELESCOPES. 



Achromatic Telescope, ■with 2^inch object-glass 

 of the best quality, 36-inches focus, with 

 celestial and terrestrial eye-piece, on Brown- 

 ing's improved equipoised tripod stand, 

 which enables the observer to command the 

 zenith, the Telescope with rack adjustment 

 in case 



£10 



Achromatic Telescope, witn 3-inch object-glass 

 of the best quality, 48-inches focus, two 

 celestial eye-pieces, powers 60 and 150, and 

 one terrestrial eye-piece, fitted with the 

 improved equipoise tripod stand, the Tele- 

 sco{>e with rack adjustment packed in case 



£20 



Achromatic Telescope, with 4-inch object-glass 

 of the best quality, 60-inches focus, three 

 celestial eye-pieces, powers 60, 150, and 200, 

 and one terrestrial eye-piece on equipoise 

 tripod stand, the Telescope with rack adjust- 

 ment packed in case 



£30 



Citalogus of Achromatic Telescopes, Astronomical and Terrestrial, sent free by post 



JOHN BROWNING, 



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



FACTORY— SOUTHAMPTON STREET, LONDON, W.C. 



w.c. 



ESTABLISHED 100 YEARS. 



