A WEEKLY 
°§To the 
ILLUSTRATED JOURNAL OF SCIENCE. 
solid g 
round 
Of Nature trusts the mind which builds for aye.” —WORDSWORTH. 
No. 1413, VOL. 55] THURSDAY, 
NOVEMBE 
R 26, 1896. [PRICE SIXPENCE. 
Registered as a Newspaper at the General Post Office.] 
[All Rights are Reserved. 
INDUCTION COILS. 
Messrs. NEWTON & CO., of 3 Freer Srreer, Lonpon, 
. have made an arrangement with Mr. Aprs by which the results 
of his unequalled experience in large Coil making have been 
fully placed at their disposal. 
As he has been unable to cope with the demand for these 
instruments, Apps’ Patented Coils are now manufactured con- 
currently-by Messrs. NEwron & Co. on their own premises. 
These Coils:have for many years been acknowledged the best 
and most efficient in the world, and it is hoped that the high 
quality of workmanship maintained in Messrs. NEWTON & Co.’s 
workshops may still further increase their reputation. 
All the Coils up to 10-inch are tested to considerably more 
than the guaranteed length of spark. 
Spark in air. Reis. a. Spark in air eS d. 
I in, ces. 'O 8 in. (with pillars) 27 io fo) 
eye ToerO' © | I0 ,, Pe SOR (oO 
3» Hs 1212 0} 15 ,, h 63 0 0 
aoa; : Peers DS, (0) | 18 ” 7s: Mesto) 
6 ,, (with pillars) 22 10 oO "Larger sizes to order. 
All the above Coils are covered in ebonite, and are of the 
highest quality, and all are fitted with Commutator and five pairs 
of Terminals so that they can be used with Primary Batteries or 
Accumulators or direct from the main, and the Condenser can be | 
cut out if desired, which should be done when using alternate 
currents. 
X-RAY COMPLETE SETS. | 
Sev A. Including 3-inch Coil, our own make, Batteries, Focus 
ube, Tube Holder, Barium-Platino-Cyanide Screen, 
Zin. x 5 in, . £138 0 0 
Set B. Including 6-inch Coil, Batteries, ‘Large r : Focus Tube, 
Tube Holder, Barium-Platino-Cyanide Screen, 9} in. x 7 in. £23 10 0 
BARIUM-PLATINO-CYANIDE SCREENS. 
EXCELLENT FLUORESCE NCE, in neat Frames with Handles. 
7 in. X 5in., 215.3 gh in. x 7 in., 32s. 6d. ; tr} in. X g}in., 55s. 
JOHN J. GRIFFIN & SONS, L. 
22 GARRICK STREET, LONDON, W.C. 
‘NALDER BROS. & CO., tonoon. 
D'ARSONVAL GALVANOMETER 
Delivered Free anywhere in U.S.A. for $32 C.0.D. 
Write for 
CATALOGUES. 
D’'ARSONVAL 
GALVANOMETER 
(As illustrated). 
VERY PORTABLE 
SENSITIVE. 
IN STOCK. 
£5 0 0 
NO AGENTS 
IN 
U.S.A. 
[eens & ZAMBRA’S | 
‘BINOCULARS AND TELESCOPES. 
Makers of the “OFFICER OF THE WATCH” TELESCOPE, 
in use on ae the vessels of H.M. Navy 
Nickel-plated, covered with Brown 
eather. 
£2 10s. 
PRICE ..: 
Perrect Derinition & HicH Power. 
“ARMY 
SIGNALLING” TELESCOPE. 
£2 2s. 
As supplied by NEGRETT! & ZAMBRA to the War Office. 
Length, when closed, rx inches. Combining high power and portability. 
NEGRETTI & ZAMBRA, 
SCIENTIFIC INSTRUMENT MAKERS to the QUEEN, 
38 HOLBORN VIADUCT, E.C. 
Branches : 45 CORNHILL; 122 REGENT STREET. 
ILLUSTRATED Prick Lists FREE By Post. 
