| 
5 
A WEBKIEY IkCUSTRATED JOURNAL, OF SCIENCE 
** To the solid ground 
Of Nature trusts the mind which builds for aye.’’-—WoORDSWORTH 
J Ly 
No. 825, VOL. 32] 
THURSDAY, AUGUST 20, 
1885 [PRICE SIXPENCE 
Registered as a Newspaper at the General Post Office] 
[All Rights are Reserved 
MICROSCOPISTS, | 
ASTRONOMERS, 
SURGEON DENTISTS. 
Ay Ie 
To 
THE SWAN LAMP. 
AND FITTINGS may be purchased at 
MAWSON AND SWAN'S STORE, 
31, FARRINGDON .STREET, E.C., & MOSLEY STREET, 
|GRACE'’S NEW DIRECT VISION 
SPECTROSCOPE. 
ot <= 
rand Lonoon—————— 
Mr. JOHN BROWNING begs to direct attention to the 
advantages of this very powerful, portable, and efficient Instru- 
ment, which will divide the Sodium lines or the D lines in the 
Solar Spectrum, and show the Rain-Band as S:parate Lines ; it 
| is provided with a fine motion focusing arrangement, and it is 
applicable to every purpose for which a Direct Vision Spectro- 
scope can be used. 
Price in Morocco Leather Case, £3 8s. 6d. 
Illustrated Catalogue of Spectroscopes sent post free, Sixpence. 
JOHN BROWNING, 
| Optical and Physical Instrument Maker to H.M. Government, 
63, STRAND, LONDON, W.C. 
NEWCASTLE-ON-TYNE. 
R. & J. BECK’S 
mew MICROSCOP SG, 
eH Be Sule ldees 
PRICES. aw se a: 
Stand, with 1-in. Object- 
glass .. Be ores eV Pet) 
Stand, with I-in. and 4-in. 
Object-glasses ... S370 
Stand, with Rack and Pinion, 
coarse adjustment, 2 Eye- 
pieces, and 1-in. Object- 
drs be ne Sy 0) 
glass ... 
Full Descriptive Pamphlet sent on 
Application to 
R. &J. BECK, 68, Cornhill, London, E.¢. 
GOLD MEDAL 
International Inventions Exhibition, 1885. 
NEGRETTI AND ZAMBRA, 
SOLE MAKERS OF 
JORDAN'S (PATENT) SUNSHINE RECORDER. 
PRICE £3 3s. 
NEGRET FT 1 
AND 
ZAMSBRA, 
ScientTIFIC INSTRUMENT MAKERS 
TO THE QUEEN, 
HOLBORN VIADUCT. 
Branches :—45, Cornhill ; 
122, Regent Street, London. 
Illustrated Description Post Free. 
NEGRETTI & ZAMBRA’S 
Large Illustrated Catalogue, 
600 Pages, 
\ 
1200 Engravings. 
Price 5s. 64. 
