A WEEKLY ILLUSTRATED 
“To the soli 
Of Nature trusts the mind which builds for aye. 
a OF SCIENCE. 
ground 
””__WoORDSWORTH. 
No. 2235, VoL. 89] THURSDAY, 
Registered 3 asa a Newspaper at the General Post Office. J] 
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 RAINBOW CUP 
C. V. BOYS'S PATENT. 
MAGICAL 
COLOUR 
ASTOUNDING | 
EFFECTS 
A_NEW_ INSTRUMENT 
for studying the colours of thin films. Produces the most 
beautiful colour forms and colour changes imaginable. 
Price 2Ss., including two bottles of special soap solution 
and full instructions. 
SOLE MAKERS: 
JOHN J. GRIFFIN & SONS, Ltd. 
AUGUST 20, 
| 14 Commercial Street, 
Kemble St., KINGSWAY, LONDON, wW.C. 
_ [Price SIXPENCE _ 
[All Rights Reserved. 
IQi2 
“REYNOLDS & BRANSON, LTD. 
MAGNALIUM 
BALANCES. 
The beam, standard, and 
pans of these balances are 
made of magnalium, which is 
lighter and cleaner than brass, 
and not as readily affected by 
fumes and gases. The knife- 
edges and planes are of agate. 
Too gms. 250 gms. 500 gms. 
Sensitive to— 
I mg. 2 mg. 5 mg. 
| = S. d. s d. Se 
| Solid beam . 24 6 26 O 310 
| Open ,, ‘ 25 6 27 6 32 0 
**Rystos’ palace Case (Regd. No. 532952), with sliding door which 
folds back and rests upon the top of the balance case, obviating the necessity 
for catches or balance weights. Mahogany, 8/6, 10/6, 14/6 each. 
ANALYTICAL BALANCES WITH MAGNALIUM BEAMS. 
Price List on Application. 
Leeds. 
Student Equatorial 
Telescope 
with 3-inch object glass, and circles 4 inches dia- 
meter divided on brass, the hour: circle reading 
to 1 minute, the declination to 5 minutes. 
Complete in pine case, with 3 eyepieces. 
Price £25. 
Illustrated List 
of Telescopes 
Jree on request, 
NEGRETTI 
e ZAMBRA, 
Holborn Viaduct, 
London, E.C. 
Branches : 
E.C. 
Ww, 
45 Cornhill, 
22 Regent St., 
