A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ground 

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



No. 491, Vol. 19] 



THURSDAY, MARCH 27, 1879 



[Price Sixpence 



Registered as a Newspaper at the General Past Office.] 



[.\11 Rights are Reserved. 



THE NEW BINOCULAR TELESCOPES. 



These instruments are the most powerful Binociilars 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 folly illuminated, otherwise 

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

 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 viade out by them which li'oitld be invisible with any ordinary Binocular. 



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

 with object-glasses \\ inches diameter, in solid sling leather case ... ;^9 lo o 



BiNOCUiAR Telescope, the same, but with object-glasses if inches diameter, in solid 

 sling leather case ... ... ... ... ... ... ... ... £,ix o o 



Binocular Telescope, with object-glasses i| inches diameter ... ... ^^13 o o 



BiNocuL.\R Telescope, as above, with object-glasses \\ inches diameter, in solid sling 

 leather case ... ... ... ... ... ... £\(i o o 



THE NE^NTBIlSrOCULAB TELESCOPES 

 IN ALUMINIUM. 



BiNOCtLAR 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 ... ... ... ... ... ... ^15 o o 



Binocular Telescope, as above, object-glasses If inches diameter ... ;^i8 10 o 

 Binocular Telescope, as above, object-glasses If inches diameter ... £21 10 o 

 Binocular Telescope, as above, object-glasses i| inches diameter ... ^30 o o 



Opera Glasses in chaice 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. 



~~J O H N B RO W N I N G, 



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. 



Microscopes, Spectroscopes, Opera Glasses, 6t*c., Sr^c. 



