im WEEKLY 
‘© To the 
Of Nature trusts the 
mind which 
ILLUSTRATED JOURNAL OF SCIENCE. 
solid ground 
burlds for aye.” —WORDSWORTH. 
No. 1411, VOL. 55] 
THURSDAY, NOVEMBER 12, 1896. 
[PRICE SIXPENCE. 
Registered as a Newspaper at the General Post Office.] 
(All Rights are Reserved. 
INDUCTION COILS. 
Messrs. NEWTON & CO., of 3 Frerr Street, Lonpon, 
have made an arrangement with Mr. Apps 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 to-inch are tested to considerably. more 
than the guaranteed length of spark. 
Spark in air. & s. ad. \ Spark in air. FESS OB 
I in Sete) 8 in. (with pillars) 27 10 0 
ots a Pro: )O-| 10. 4) | %5,!° "6 PBONtg 10 
Sie ET 2» 0! |) TS: 55° | 35 | ap 163, (04-0 
Ans ae Peepers (Ov) 18) 55 FY Hy 7k © 
6 ,, (with pillars) 22 10 0 | Larger sizes to order. 
All the above Coils are 
highest quality, andall 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 dee when using alternate 
currents. 
X-RAY COMPLETE SETS. 
Ser A. Including 3-inch Coil, our own make, Batteries, Focus 
Tube; Tube Holder, EAGT Platino- Cy: anide Screen, 
7. in. Xx 5 in. os 
Ser B. Including 6-inch Coil, Batte sarger ; Focus Tube, 
Tube Holder, Barium-Platino-Cyz anide Screen, oy in. x 7 in. £23.10 0 
BARIUM-PLATINO-CYANIDE SCREENS. 
EXCELLENT FLUORESCENCE, in neat Frames with Handles. 
7 iM. X.5.1M., 21s..; gt in. X 7.in., 32s. 6d. ; 11} in. X ghin., 55s. 
JOHN J. GRIFFIN & SONS, 2 
22 GARRICK STREET, LONDON, W.C. 
covered in ebonite, and are of the | 
NALDER BROS. & CO. 
LONDON. 
N. C. S. 
TEHEOMSON 
REFLECTING 
GALVANOMETER, 
5000 OHMS: RESISTANCE. 
VERY SENSITIVE. 
PRICE 
L939 10 O 
Write for CATALOGUES, 
Cable Address: 
- SECOHM, LONDON. 
No Agents in U.S.A, 
This instrument delivered Free anywhere in U.S.A. 
for 360 C.0.D. 
NEGRETTI & ZAMBRA’S 
BINOCULARS AND TELESCOPES. 
Makers of the “*OFFICER OF THE WATCH" TELESCOPE, 
in use on all the vessels of H.M. Navy. 
NECRETTIZ ZA BRA 
— ES 
Nickel-plated, covered with Brown 
Leather. 
PRICE ... -- £2 10s. 
Perrect Derinirion & Hicu Power, 
“ARMY SIGNALLING” TELESCOPE. 
As supplied by NEGRETT!I & ZAMBRA to the War Office. 
Leugth, when closed, 11 inches. Combining high power and portability. 
NEGRETT!I & ZAMBRA, 
SCIENTIFIC INSTRUMENT MAKERS to the QUEEN 
38 HOLBORN VIADUCT, E.C. 
Branches : 45 CORNHILL; 122 REGENT STREET. 
ILLUSTRATED Prick Lists FREE BY Post. 
