A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ground 

 Of Nature trusts the mind whiih builds for aye." — WORDSWORTH 



BROWNING'S 



ASTRONOMIGAL 

 TELESCOPES. 



Silvered Glass REFLECTING 

 TELESCOPE, with Parabolic 

 Mirror, 8J in. in diameter, with 

 12-inch rotating Hour Circle, 

 reading to 5 seconds, and Decli- 

 nation Circle, reading to I minute, 

 with Clock-work Driving Appa- 

 ratus, fitted with Differential Mo- 

 tion complete; and 3 Huyghenian 

 eye-pieces, magnifying respec- 

 tirely 85, 200, and 400 diameters. 



PRICE £153 10s. Od. 



Telescopes as above, with Mir- 

 rors, 44 in., 64 in., 9J in., lo^ in., 

 i2\ in., 13 in., or 15 in. diameter. 



PRICE LIST FREE. 



Sixth Edition, with much New 

 Matter. 

 A PLEA for REFLEC- 

 TORS : Being a Description of 

 the New Astronomical Telescopes, 

 with silvered glass specula, and in- 

 structions for using and adjusting 

 them, with many Illustrations and 

 Coloured Frontispiece of Jupiter. 

 By John Browning, F.R.A.S. — 

 One Shilling, post free. 



JOHN BROWNING, 



optical and Physical Instrument 

 Maker to II. M. Government, the 

 Royal Society, the Royal Observa- 

 tories of Greenwich, Edinburgh, 

 &'c., &'C. 



63, STEAND, W.C, 

 LONDON. 



, i^tory — Southampton Street and Exeter 



Street, London. 



I'riu Afedal, 1863. Ettabiisfud looy'fars. 



Microscopes Spectroscopes, Opera 



Glasses, &c.f &c. 



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