A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ground 

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



No. 512, Vol. 20] 



THURSDAY. AUGUST 21, 1879 



[Price Sixpence 



Registered as a Newspaper at the Genetal Post Office.] 



(All Rignts are Kescrveo 



BROWNING'S 



ACHEOMATIC TELESCOPES. 



Achromatic Telescope, with 2j-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 Telescopa with rack adjustment 

 in case 



£10 



Achromatic Telescope, with 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- 

 scope 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 



Citalogua of Achromatic Telescopes, Astronomical and Terrastrial, sent free by post. 



JOHN BROWNING, 



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



KOVAL OBSERVATORY OK GREENWICH, AND THE OBSERVATORIES OF KEW, CAMHRIDGE, 



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 joo YEARS 



