sb 6 4) 
mB WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 
‘°To the solid ground 
Of Nature trusts the mind which builds for aye.’—Worvswortu. 
No. 1417, VOL. 55] THURSDAY, DECEMBER 24, 1806. [PRICE SIXPENCE. 
Registered as a Newspaper at the General Post Office.] {All Rights are Reserved 
tera! WPUCTION COILS. = = NALDER BROS. & CO., conoon. 
3 FLEET STREET, LONDON 
Bi ie one teecence in large Coil mating bare teen'| D’ARGONVAL -GALVANOMETER 
fully placed at their disposal. : 
As he has been unable to cope with the demand for these Delivered Free anywhere in U.S.A. for $32 C.0.D. 
instruments, Apps’ Patented Coils are now manufactured con- 
currently by Messrs. NEwron & Co. on their own. premises. Write for 
These Coils have for many years been acknowledged the best | CATALOGUES. 
and most efficient in the world, and it is hoped that the high | = 
quality of workmanship maintained in Messrs. NEWTON & Co.’s D'ARSONVAL 
workshops may still further increase their reputation. 
All the Coils up to 10-inch are tested to considerably more | 
than the joaeannees length of spark. | CALVANOMETER 
Spark in air. ess) 2. Spark in air. & ai} Gsiullustrated): 
ais «tee ees 5) O 8 in. (with pillars) zi 7a oO | 
Sy Sr ETO, 0). IO-',3: « /g58 95 615 oO | Vener OR TABLE: 
CuSy on meeteer2 © | 15 ,; e ) &3 (ore) SENSITIVE. 
Bossy we eis CO | 18, =4 She Or O | eee 
6 ,, (with pillars):22 10 oO Larger sizes to order. IN STOCK. 
All the above Coils are covered in ebonite, and are of the ee 
highest quality, andall are fitted with Commutator and five pairs £5 _O (@) 
of Terminals so that they can be used with Primary Batteries or 2 
Accumulators or direct from the main, and the Condenser can be | = NO AGENTS 
cut out if desired, which should be done when using alternate | — U. e A. 
currents. | 
THE 
PRESENTS. CINEMATOGRAPH. 
X-RAY COMPLETE SETS. / _CHRISTHAS 
Ser A. Including 3-inch Coil, our own make, Batteries, Focus 
Tube, Tube Holder, Barium-Platino- SUE anide Screen, 
7in. X 5 in. £13 0 0} ti 
By is Apparatus is capable of producing Animated Pictures of the ees 
Ser B. Including 6-inch Go rik Batte ries, Sere er r Kc ocus ; Tube, class, and can be easily manipulated without the assistance of a skilled 
Tube Ho D Scre x 
Ider, Barium-Platino-Cyanide Screen, 94 in. x 7 in. £23 10 0 operator by following the instructions supplied with same. 
BARIUM- PLATINO- CYANIDE SCREENS. Price , including L teen Oxyhydrog en Burner Limes, &c., complete, £36. 
EXCELLENT FLUORESCENCE, in neat Frames with a NEGR E ee & TA MBRA 
7 in. X 5 in., 218.3 9 in 7 in., 325. 6d. 5 119 in. X of in., 
JOHN J. GRIFFIN & SONS. ‘p. 38 HOLBORN VIADUCT, E.C. : 
22 GARRICK STREET, LONDON, W.C, | Branches—5 CORNHILL, and 122 REGENT STREET. 
