f-i- 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



"To the solid ground 

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



No. 509, Vol. 20] 



THURSDAY, JULY 31, 1879 



[Price Sixpence 



Registered as a Newspaper at the General Post OfEce.] 



[All Rights are Reserved. 



THE NEW BINOCULAR TELESCOPES. 



These instruments are the most powerful Binoculars that can be made to be suffi- 

 ciently portable enough for the tourist's use ; their magnifying power is so great that they 

 require a steady hand to use them, and the objects must be fully illuminated, otherwise 

 they will not give as much satisfaction as the " Panergetic," or other high-class ISinocnlars; 

 they should be regarded as Telescopes, more than as prospect glasses ; and where there 

 is a sufficient amount of light, and the circumstances are favourable to their use, objects 

 may easily be made out by them which tvould be invisible ivith any ordinary Binocular. 



Binocular Telescope, with rack motion in centre to adjust it to the width of the eyes, 

 ■with object-glasses I i inches diameter, in solid sling leather case ... £^ lo o 



Binocular Tfxescope, the same, but with object-glasses i| inches diameter, in solid 

 sling leather case f^\i o o 



Binocular Telescope, with object-glasses if inches diameter ;f 13 o o 



Binocular Telescope, as above, with object-glasses l| inches diameter, in solid sliog 

 leather case £\() o O 



THE 



NE^W BINOCULAR TELESCOPES IN 

 ALUMINIUM. 



Binocular Telescope, with rack motion in centre to adjust it to the width of the eyes, 

 and central focussing screw motion with object-glasses Ij inches diameter in solid 



aluminium in sling leather case £1^ O 



Binocular Telescope, as above, object-glasses i| inches diameter ... ;^i8 10 



Binocular Telescope, as above, object-glasses i| inches diameter ... ;^22 lo 



Binocular Telescope, as above, object-gUsses i| inches diameter ... £yi o 



Opera Glasses in choice enamel, inlaid with gold or silver and jewels for presentation. 

 Special Eye-Glasses worked for Opera and Field Glasses for peculiar sights. 

 Spectacles and Eye Glasses carefully adapted to suit all peculiarities of vision. 

 Cylindrical Lenses for the relief of Astigmatism. 



Catalogues of Telescopes, Microscopes, Spectroscopes, Meteorological and other Instruments on application. 



JOHN BROWNING, 



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

 THE ROYAL OBSERVATORIES OF GREENWICH, EDINBURGH, &c, &c. 



6 3, STRAND, W.C, LONDON. 



FACTORY— SOUTHAMPTON STREET and EXETER STREET, LONDON. 

 PRIZE MEDAL, 1862. ESTABLISHED 100 YEARS. 



Microsc0pei, Spectroscopes, Opera Glasses, Sfc, £r'c. 



