SSS 
A WEEKLY. [LLUSYPRAT 
=D JOURNAL OF SCIENCE. 
“To the solid ground 
Of Nature trusts the mind which butlds for aye.” —WORDSWORTH. 
No. 1548, VOL. 60] 
THURSDAY, JUNE 29, 1899. 
[PRICE SIXPENCE. 
Registered as a Newspaper at the General Post Office.] 
NEWTON & CO.’S 
CHEAP TELESCOPE. 
Look-out Telescope, having a 3-in. Object-Glass, Body 
Tube of Brass, 34 feet long, fitted with Rack and Sliding 
Tubes for Adjustment, mounted Altazimuth with Metal Cradle 
and Bearings on Mahogany Stand, 5 feet high. The Terrestrial 
fye-piece will show a church clock at 10 miles distance, and 
the Astronomical Eye-piece the Moon, Jupiter, Saturn, and 
divide many of the Double Stars. £7 10s. 
CATALOGUE OF TELESCOPES ON APPLICATION. 
NEWTON & CO. 
OPTICIANS TO THE QUEEN AND GOVERNMENT, 
3 FLEET STREET, LONDON. 
BEC F’S 
NEW Z 
MICROSCOPE 
THE 
“BRITISH STUDENTS.” 
Microscope Stand No. 55, as 
figured, with Iris Diaphragm, 
One Eye-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. 
[All Rights are Reserved: 
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. 
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. r 
In nickelised German Silver, each power, 17s. 6d. 
Illustrated Description sent free. 
| JOHN BROWNING, 63 STRAND, LONDON, W.C. 
NEGRETTI & ZAMBRAS 
IMPROVED 
SELF-RECORDING 
RAIN GAUGE. 
DESCRIPTIVE 
PRICE LIST 
POST FREE. 
INVENTED AND MADE ONLY BY 
NEGRETTI & ZAMBRA, 
Scientific Instrument Makers to Her Majesty the Queen, 
38 HOLBORN VIADUCT, E.C. 
Branches— 45 CORNHILL, E.C., and 122 REGENT STREET, W. 
