PVE ICY TecUSmeATED JOURNAL OF SCIENCE: 
© To the solid 
ground 
Of Nature trusts the mind which burlds for aye.”—Wornsworvu. 
No. 1434, Vor. 55] 
TAURSDANG APRIL) 22, 1897: 
[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. | 
iy 
=n, Citi) 
a 
‘ena “EOCUS” TUBES; 25s.: « 
FLUORESCENT SCREENS, 68s. and 90s. 
Complete Apparatus for Réntgen ‘‘ X”’ Rays, with Coils 
and Fluorescent Screens, &c. ; 
Hic Ee Sime ALITY -.ON LY. 
Detatled List on Application. 
The Frena Camera 
eoevcceeeccoseoece 
PARTICULARS of. this 
unique HAND-CAMERA | 
may be had FREE on | 
application to 
R. & J. BECK, 
Ld., 
68 CORNHILL, 
LONDON, ;£.C, 
ia 
WeBODAISHI vP-To-DATS 
adapted for the Student’s use ; 
~ > [All Rights are Reserved. 
B Re@OaW. NeirNaGeasS 
COU RU SHY os 
E4, 
microscope 
Is a superior instrument, well 
it is made entirely of Brass, and 
perfectly fitted ; it has a sliding 
body, drawer tube, fine adjust- 
ment, A eyepiece, and § in. 
and 4 in. objectives. 
£6 2s. 6d. 
Tllustrated Catalogue past free. 
JOHN BROWNING, 
63 STRAND, | 
L OOU PQs W.C. . Das 
NEGRETTI AND ZAMBRA’S 
THERMOGRAPHS, 
PRICE 
AEGRETT! &ZAM BRAY 
is fitted in a Mahogany Case with Glass Front, as show! 
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Front, for either indoor or outdoor use. The above give continuous records 
on Charts, which only require changing once a week, and _ are invaluable to 
invalids and others who are unable to take daily readings of the ordinary 
instruments. Price of each, with supply of Charts for one year, £6 10s. 
NEGRETTI & ZAMBRA, 
SCIENTIFIC INSTRUMENT MAKERS to the QUEEN. 
38 HOLBORN VIADUCT, E.C. 
Branches : 45 CORNHILL, and 122 REGENT STREET. 
The Barograph 
