1p 



fflh 



A VVKEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



*' To the solid ground 

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



BROWNING'S PLATYSCOPK! LENS. 



With Larger Angles, Increased Field, and Improved Definition 



BUILDER'S or DRAINING LEVEL. 



lo-inch Telescope and ground bubble on Tripod Stand, fitted 



with Parallel Plates. Useful for accurately reading oft' divisions 



in Laboratory work. 



COMPLETE, IN C.\SE, £5 5 0. 



yj thoroughly sound instrument of first-class workmansliip. 



NEWTON & CO., 3 FLEET STREET, LONDON. 



! NEW 



iMICROSCOPE 



THE 



"BRITISH STUDENTS." 



Microscope Stand No. 55, as 

 figured, -with Iris Diaphragm, 

 One Eye-piece; Double Nose- 

 piece, Two Object-glasses, 2/3" 

 and 1/6", adjusted to be in 

 about focus, and the whole 

 packed in polished Mahogany 

 Case, 



£6:8:6 



68 CORNHILL, LONDON, E.C- 



Eu-r,ived Real size, 

 AN ACHROMATIC COMBINATION, 



COMBINING THE DEFINITION OF A MICROSCOPE WITH THE 

 PORTABILITY OF A POCKET LENS. 

 " If you carry a small Platyscopic Pocket Lens (which every observer of 

 Nature ought to do)." — Grant Allen in K7ioivlcdge, 



The Platyscopic Lens is invaluable to botanists, mineralogists, or ento- 

 mologists, as it focuses about three times as far from the object as the 

 Coddington Lenses. This allows opaque objects to be examined easily. 



The Platyscopic Lens is made of foi ■ dei^rees of power, magnifying 

 respectively lo, 15, 20, and 30 diams. ; ih .\o^ftst power, having the largest 

 field, is the best adapted for general use. 



The Lenses are set in Ebonite Cells, and mounted in Tortoiseshell Frames. 



Price of the Platyscopic Lens, vtonnted in Tortoiseshell, vtagnifyifig either 



ID, T5, 20, or 30 diameters, each power^ 15s. 



In nicfeelised German Sitver, each poivcr, 17s. 6d. 



Illustrated Description sent free. 



JOHN BROWNING, 63 STRAND. LONDON, W.C. 



SPECTACLES 

 ELECTRIC UCHT, INCANDESCENT GAS. 



And other- Powerful Illuminanls. 



NEGRETTI & ZAMBRA'S 

 THERMOSCOPIC LENSES 



Protect the Eyes from Glare, .ind 



RENDER THE LIGHT SOFT AND COOL 



Illustrated Price Lists of Optical and Mcteonlciical Instruments 

 Free by Post to alt /-arts cl the U'ortd. 



NEGRETTI and ZAMBRA, 

 SCIENTIFIC INSTRUMENT MAKERS to THE QUEEN, 



38 HOLBORN VIADUCT, EX. 



BRANCHES : 45 CORNHILL; 122 REGENT STREET. 



