AN SNARES AULILIUS TURIN DOWNIE, Old SSMS Cie, 
“To the solid ground 
Of Nature trusts the mind which builds for aye.” —WORDSWORTH. 
No. 1556, VOL. 60] 
THURSDAY, AUGUST 24, 1899. 
[PRICE SIXPENCE. 
Registered as a Newspaper at the General Post Office.] 
INDUCTION COILS. 
APPS’ PATENTED INDUCTION COILS are now manufactured 
concurrently by 
NEWTON & CO., 3 FLEET STREET, LONDON. 
X? RAYS & FOCUS” u TU BES, ¢ 25s. 
FLUORESCENT SCREENS, 68s, and 90s. 
Complete Apparatus for Réntgen ‘‘ X”’ Rays, with Coils 
and Fluorescent Screens, &c. 
HiGHesr ) QUALITY omly,. 
Detailed List on Application, 
[All Rights are Reserved 
BROWNING’S PLATYSCOPIC LENS. 
With’Larger Angles, Increased Field, and ImprovedjDefinition 
Engraved Real Size. 
AN ACHROMATIC COMBINATION, 
COMBINING THE DEFINITION OF A MICROSCOPE WITH THE 
PORTABILITY OF A POCKET LENS, 
“Tf you carry a small Platyscopic Pocket Lens (which every observer of 
Nature ought to do).”—GranT ALLEN in Knowledge. 
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 four degrees of power, magnifying 
respectively ro, 15, 20, and 30 diams. ; the lowest power, having the largest 
field, is the best adapted for general use. 
The Lenses are set in Bgl: Cells, and mounted in Tortoiseshell Frames. 
Price of the Bie bes enS, MLOUN ted in Tortotseshell, magnifying either 
5, 20, 0% 30 diameters, each power, 15s. 
In nicketned ‘German Silver, each power, 17s. 6d. 
Illustrated Teceoten sent free. 
JOHN BROWNING, 63 STRAND, LONDON, W.C. 
BEC FE,’ 
NEW 
MICROSCOPE 
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 
R. & J. BECK, Lta., 
68 CORNHILL, LONDON. E.C. 
No. 55. 
NEGRETTI & ZAMBRA’S 
BINOCULARS AND TELESCOPES. 
&& (Makers of the “‘OFFICER OF THE WATCH" TELESCOPE, 
in use on all the vessels of H.M. RENEE 
covered with Brown 
eather. 
2 10s. 
Nickel-plated, 
PRICE ... 
Perrecr Derinition & HicuH Power. 
iG” TEL LESCOPE. 
“ARMY SIG ALLING 
As supplied by NEGRETTI & ZAMBRA to the War Office. 
Length, when closed, rr inches. Combining high power and portabiliry. 
NEGRETTI & ZAMBRA, 
SCIENTIFIC INSTRUMENT MAKERS to the QUEEN 
38 HOLBORN VIADUCT, E.C. 
Branches: 45 CORNHILL; 122 REGENT STREET. 
