LENS 
' ENGRAVED REAL SIZE. 
A NEW ACHROMATIC COMBINATION, 
Combining the Definition of a Microscope with the Portability of a Pocket Lev 
The Platyscopic Lens is invaluable to botanists, mineralogists, or entomologist | 
as it focusses about three times as far from the object as the Coddington Lens< 
This allows opaque objects to be examined easily. 
The Platyscopic Lens is made of three degrees of power, magnifying respective j| 
15, 20, and 30 diams. ; the lowest power, having the largest field, is the best adapt I 
for general use. 
The Lenses are set in ebonite cells, and mounted in tortoiseshell frames/ , 
Price of the Platyscopic Lens, mounted in Tortoiseshell, magnifying either 15, 20, or 30 diameters, 18s. 
ILLUSTRATED DESCBIPTIOU SIEUsT T PREE. 
JOHN BROWNING, 63 STRAND, LONDON, W.C. 
BROWNING’S PLATYSCOPIC 
Browning’s Pocket Microscopi 
The New Pocket or Field Microscope, on firm folding brass 
tripod stand, with fine adjustment, 1 inch objective, large field 
oy e-piece, hand-pliers, etc. Height when set up, 10 inches; 
dimensions, packed in morocco case, 5| inches long. Price 
£1 1U 6d. 
List of Microscopes sent free. 
Illustrated Catalogue of Microscopes, with 
41 Illustrations, 10 whole page Illustrations, 
sent for Six Stamps. 
JOHN BROWNING, 
Optical and Physical Instrument Maker to H.M. Government , the Royal Society, the Roy 
Observatories of Greenwich , Edinburgh, <(-c. (Cr. 
63 STRAND, LONDON, W.C. 
