A WEEKLY TEBUSTRATED JOURNAL OF SCIENCE. 
““To the solid ground 
Of Nature trusts the mind which builds for ae: 
’”__WoORDSWORTH. 
THURSDAY, 
“Registered asa Newspaper at the General Post Offi Post Office. j 
The ee INSTANTA’ 22 
INDUCTION COIL. 
The most Scientifically Designed 
and Efficient Coil in the World. 
_ No. 2212, VOL. 89] 
Ml 
Wat 
Sole Makers: 
NEWTON & WRIGHT, LTD. 
(Late Electrical Department of Newton & Co.), 
72 WIGMORE STREET, W. 
WRITE FOR NEW ILLUSTRATED CATALOGUE. 
THE HANDLE 
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 5 6 
No. 1329. Stand, incase, 
with spiral focussing 
substage 400 
No. 364A. Eye- 
piece ... os 
No. 801. ards 
Object Glass 
No. 803. 4th 
Object Glass 110 O 
5 Oy 
12 0 
Fut ParTicucars oF 
R. & J. BECK, 
68 Cornhill, E.C. 
M ARCH. 
zie 1912 
[Price SIXPENCE _ 
t [All Rights Reserved. 
* REYNOLDS & BRANSON, Lta. 
GRAND PRIX AWARD, TURIN, 1911, 
SOLE AUTHORISED MAKERS OF 
S*ROUD & RENDELL SCIENCE LANTERNS. 
The ‘* University” Lan- 
tern, with Russian iron 
body, sliding baseboard, two 
superior objectives, plane 
silvered mirror ‘A, which 
is moved by a knob causing 
the rays to be reflected 
upwards for the projection 
of objects in a_ horizontal 
plane, condensers 4} in. diam., 
prism with silvered back 
which can be used at ‘‘C,’ 
or as an_ erecting prism 
in mount ‘D,” lime-light 
burner, slide carrier. Price 
complete in travelling case, 
without reversible adjustable 
table “‘ B,” £9 10 0 
Ditto, ditto, with “ Phoenix” arc lamp 4 .10 17 6 
Reversible adjustable table ‘‘B” for supporting apparatus, extra 76 
The ‘‘ College’ Lantern, without mojastable Ele; with 
lime-light burner complete pa a FA 
Ditto, ditto, with ‘*‘ Phoenix” arc lamp ae 1) 10.10) 
Slit and prism for spectrum with support, ‘for either lantern Be i ae ee fieals 
Polariser and analyser ... cs 2) 0) 0) 
Catalogues. post. free. 
Optical Lanterns and Accessory Apparatus, 223 pases 
New Abridged List of Chemical Apparatus and Chemicals, 44 pages. 
Mechanical Models for teaching Building and Machine Construction. 
14 COMMERCIAL STREET, 
NEGRETTI & ZAMBRA’S 
RAIN GAUGES. 
LEEDS. 
Continuous 
Record on a 
Weekly Chart. 
Daily 
Observation 
Unnecessary. 
Illustrated Price List of all kinds of Rain Gauges Post Free. 
38 HOLBORN VIADUCT, LONDON, E.C. 
45 CORNHILL, E.C., 6 122 REGENT ST., W. 
