Ee EEK Eesha Dei OWR NAL Ore Sele NGI: 
“To the solid ground 
Of Nature trusts the mind which builds for aye.”—WORDSWORTH. 
No. 1558, VOL. 60] THURSDAY, SEPTEMBER 7, 1899. [PRICE SIXPENCE. 
Registered as a Newspaper at the General Post Office.] [All Rights are Reserved 
NEWTON & CO.’S inBROWNING'S PLATYSCOPIC LENS. 
NEW ASTRONOMICAL & “LOOK-OUT ” 
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 Engraved Real Size. 
ae J ae ee Tse a e AN ACHROMATIC COMBINATION, 
and Bearings on Mahogany Stand, 5 feet high. The Terrestrial compininG THE DEFINITION OF A MICROSCOPE WITH THE 
Eye-piece will show a church clock at 10 miles distance, and | PORTABILITY OF A POCKET LENS. 
the / i B=) aS " i 2 ivi “Tf you carry a small Platyscopic Pocket Lens (which every observer o 
e Astronomical Eye-piece the Saturn Ring, and divide Nase CURE HCI GAS TAUTEN ip, SoRDRULAIPE 
many of the Double Stars. £7 10s. The Platyscopic Lens is invaluable to botanists, mineralogists, or ento 
mologists, as it focuses about three times as far from the object as the 
=e 7 on Coddington Lenses. This allows opaque objects to be examined easily. 
CATALOGUE OF TELESCOPES ON APPLICATION. The Platyscopic Lens is made of four degrees of power, magnifying 
— eee respectively 10, 15, 20, and 30 diams. ; the lowest power, having the larges1 
field, is the best adapted for general use. 
N EWTO N & GC O The Lenses are set in Ebonite Cells, and mounted ’in Tortoiseshell Frames. 
s Price of the Platyscopic Lens, mounted in Tortorsesiill, DRERUDIPE etthes 
PT; Ar 7 > A ATT I0, 15, 20 07 30 diameters, each power, Ss 
OPTICIANS TO THE QUEEN AND GOVERNMENT, In nickel German Siiver, each power, 17s. 6d. 
Illustrated Description sent free. 
——— eee JOHN BROWNING, 63 STRAND. LONDON, W.C. 
Paks - NEGRETTI & ZAMBRA’S 
BEC K’S TRAVELLER'S SCIENTIFIC COMPANION. 
NEW 25 : — 
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 gat OES ee ae 
=e a “NEGRETTI & ZAMBHA, 
B K | SCIENTIFIC INSTRUMENT MAKERS TO THE QUEEN 
R. SS J. EC o) Ltd., | 38 HOLBORN VIADUCT, E.C. 2 
68 CORNHILL, LONDON, E.C, Brancnes—45 CORNHILL; 122 REGENT STREET. 
Consisting of Aneroid Barometer with Altitude Scale, Compass with Patent 
Dial ana Thermometer for Air Temperatures (or a Clinical Thermometer 
may be substituted), 
PRICE £4 10s. to £7 10s. 
Can also be had Mounted in Gold and Silver \{/ases. 
Useful Present for Gentlemen visiting the Colonies and Officers on 
Foreign Service. 
