A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ground 

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



BROWNING'S 



PLATYSCOPIC LENS. 



BROWNING'S 



POCKET MICROSCOPE. 



Engraved Real Size. 

 A NEW ACHROMATIC COMBINATION, 



COMBINING THE DEFINITION OF A MICROSCOPE WITH THE 

 > ^ PORTABILITY OF A POCKET LENS. 



The Platvscopic Lens is invaluable to botanists, mineralogist.s, 

 or entomologists, as it focosses about three times as far from the 

 object as the Coddington Lenses. This allows opaque objects to 

 be examined easily. 



The Platvscopic Lens is made of three decrees of power, 

 magnifjing respectively 15, 20, and 30 diams. ; the lowest power 

 having the largest field, is the best adapted for general use. 



The Lenses are set in Ebonite Cells, and mounted in Tortoise- 

 shell Frame?. 



Price of the Platyscopic Lens, mounted in TortoisesheU, magni- 

 Jying either 15, 20, or 30 diameters, £\ 5.% 



Illustrated description sent free. 



The New Pocket or Field Microscope, on Firm 

 Folding Brass Tripod Stand, with fine Adjustment, 

 i-inch Objective, Large Field Eye-piece, Hand-pliers, 

 &c. ; height when set up, 10 inches ; dimensions, packed 

 in Morocco Case, 55^ inches long. Price £\ \is. 6d. 



Or with i-inch and 2-inch Objectives, Stage, Forceps, 

 Stage Plate, and Dipping Tube, £2 2s. 



List of Microscopes sent free. 



Illustrated Catalogue of Microscopes, with 35 Illustra- 

 tions, 8 whole page Illustrations, sent for Six Stamps. 



JOHN BROWNING, 



OPTICAL AND PHYSICAL INSTRUMENT MAKER TO H.M. GOVERN^rENT, THE ROYAL SOCIETY, THE 

 ROYAL OBSERVATORIES OF GREENWICH AND EDINBURGH, &c., &C 



6 3, STRAND, W.C, LONDON. 



FACTORY— SOUTHAMPTON STREET and EXETER STREET, LONDON. 

 PRIZE MEDAL, 1862. Telescopes, Spectroscopes, Opera Glasses, S^c, &»c. ESTABLISHED 100 YEARS, 



