A WEEKLY JEELUSTRATED JOURNAL: OF SCIENCE. 
“To the solid ground 
The “iNSTANTA” 
INDUCTION COIL 
The most Scientifically Designed 
and Efficient Coil in the World. 
Sole Makers: 
NEWTON & WRIGHT, LTD. 
(Late Electrical Department of Newton & Co.), 
72 WIGMORE STREET, LONDON, W. 
WRITE FOR ILLUSTRATED CATALOGUE. 
THE HANDLE 2 
LONDON MODEL. 
This is a new model, in which 
the limb is made so as to form 
a convenient handle for lifting 
the microscope. Otherwise it 
is similar to the ordinary 
London model. 
No. 1325. Stand, incase, 
£3 56 
No. 1329. Stand, inease, 
with spiral focussing 
substage .. 4 OO 
No. 364A, Eye- =a 
piece ... a 5 Oo, 
No. 801. rds S 
Object Glass 12 0 
No. 803. 4th 
Object Glass 110 O 
Fuct PARTICULARS OF 
R. & J. BECK, 
68 Cornhill, E.C. 
[PRICE SIXPENCE 
i [All Rights Reserved. 
REYNOLDS & BRANSON, Ltd. 
(GRAND PRIX, TURIN, 1911.) 
q SPECIAL APPARATUS 
for Consterdine & Andrews’ 
“PRACTICAL ARITHMETIC.” 
Set ‘‘A,” 120 models, 
R&B 
5 0 
Set ‘‘ B,” 75 models, 
£0 16 6 
: (Descriptive List on 
Application.) 
Special Apparatus for Mackenzie and Forster’s 
Theoretical & Practical Mechanics & Physics. 
Detailed Catalogue on Application. 
CATALOGUES POST FREE. 
Scientific Apparatus and Chemicals. Apparatus for 
Teaching Mechanics, Machine and Building Construction. 
Optical Lanterns. Photographic Apparatus. 
| 14 COMMERCIAL STREET, LEEDS. 
The patent 
Anemo-Biagraph 
records the Velocity of the wind. 
The patent £20 0 0 
Wind Direction Recorder 
registers the Direction of the wind. 
£17 10 0 
And the Combined Apparatus re- 
cords the Velocity and Direction 
simultaneously upon one _ chart. 
£35 0 0 
Pamphlets describing above, 
and list of Meteorological 
Instruments free on request, 
NEGRETTI & ZAMBRA, 
Holborn Viaduct, London, E.C. 
Branches: 
45 Cornhill, E.C.; 122 Regent St., W. 
