ED WEEKLY TecUSTRATED JOURNAL OK SCIENCE. 
“To the solid ground 
Of Nature trusts the mind which builds for aye.” —WORDSWORTH. 
No. 1554, VOL. 60] 
THURSDAY, AUGUST Io, 1899. 
[PRICE SIXPENCE. 
Registered as a Newspaper at the General Post. Office.] 
{All Rights are Reserved. 
SUN- 
N-DIALS ON PEDESTALS. 
BRASS CIRCULAR 
HORIZONTAL 
=a  SUN-DIAL, 
zai aeeaitt 
ZEIT T YN Complete on 
i TERRA- COTTA 
: PEDESTAL. 
12-in. diameter, £6 10s. 
Sun-Dials of every Description 
Price Lists on Application. 
NEWTON & CO., 
Opticians to the Queen 
and Government, 
3 FEEERSSHREEM, 
BROWNING’S PLATYSCOPIC LENS. 
With Larger Angles, Increased Field, and Improved Definition. 
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. 7 
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 10, 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 Tortoiseshell Frames. 
Price of the Platyscopic Lens, mounted in Tortoiseshell, magnifying either 
10, 15, 20, 07 30 diameters, each power, 15S. 
In nickelised German Silver, each power, 17s. 6d. 
Illustrated Description sent free. 
| JOHN BROWNING, 63 STRAND, LONDON, W.C. 
SES =. 
BEC FE&, 
NEW 
MICROSCOPE 
THE 
“BRITISH STUDENTS.” 
Microscope Stand No. 55, as 
figured, with Iris Diaphragm, 
One EHye-piece; Double Nose- 
piece, Two Object-glasses, 2/8” 
and 1/6’, adjusted to be in 
about focus, and the whole 
packed in polished Mahogany 
Case, 
£6:8:6 
R. & J. BECK, Ltd., 
68 CORNHILL, LONDON. E.C. 
NEGRETTI & ZAMBRA’S 
BINOCULARS AND TELESCOPES. 
Makers of the ‘OFFICER OF THE WATCH” TELESCOPE, 
in use on all the vessels of H.M. Navy. 
Nickel-plated, covered with Brown 
Leather. 
PRICE ... -. £2 10s. 
PerFrect Derinition & HicGH Power. 
As supplied by NEGRETTI & ZAMBRA to the War Office. 
Length, when closed, rx-inches,. Combining high power and poftability. 
NEGRETTI & ZAMBRA, 
SCIENTIFIC INSTRUMENT MAKERS to the QUEEN 
38 HOLBORN VIADUCT, E.C. 
Branches: 45 CORNHILL; 122 REGENT STREET. 
