A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ground 

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



No. 508, Vol. 20] 



THURSDAY, JULY 24, 1879 



[Price Sixpence 



Registered as a Newspaper at the General Post Office.] 



[All Rights are Reserved. 



BEOWNING'S NEW BINOOULAES, 



THE "EURYSCOPIC" OPERA, £2 2s. 



For the Theatre, has the largest field of view, giving delightfully easy vision. 



f 



THE 



PANERGETIC" OPERA, FIELD, AND RACE GLASS, 



For general use, brilliant light, extensive field of view, and sharp definition. 

 NOTICES OF THE PRESS. 



" Bnng« out figures with marvellous distinctness, and has a very large 

 field of view, and so many advantages over the other Binoculars that we 

 have seen, that we confidently award very high praise indeed." 



*^ « Pofinlar Science Revieiv, 



" Exhibits objects with remarkable brightness and sharpness." 



TAe Obief ver. 



A wide extension of the field o£ view is attained, while even in misty 

 weather objects are exhibited with wonderful clejirncss." 



Naz'al afid Military Gazette. 

 *' A very extensive field of view is obtained, and objects in the distance 

 are shown with great distinctness," 



English Churchman. 



PRICE £4 los., £5 los,, and £6 los. 



ILLUSTRATED LIST FREE BY POST. 



ACHROMATIC OPERA GLASS, IN CASE, FROM los. 6d. 



JOHN BROWNING, 



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



ROYAL OBSERVATORIES OF GREENWICH AND EDINBURGH, AND THE OBSERVATORIES OF 



KEW, CAMBRIDGE, DURHAM, UTRECHT, MELBOURNE, &C., &C. 



63, STRAND, W.C. 



FACTORY— SOUTHAMPTON STREET. LONDON, W.C. ESTABLISHED loo YEARS. 



