NICU SARA TOE ID) 
“To the solid g 
A WEEKLY 
JOURNAL OF 
SCIENCE. 
"youna 
Of Nature trusts the mind which butlds for aye.’ 
b) 
—WorDSWORTH. 
No. 1427, VOL. 55] 
THURS DAWA NIARICE: 4; 
1897. [ PRICE SIXPENCE 
Registered as a Newspaper at the General Post Office.] 
{All Rights are Reserved. 
INDUCTION COILs. 
APPS’ PATENTED INDUCTION COILS are now manufactured 
concurrently by 
NEWTON & CO., 3 FLEET STREET, LONDON. 
“X" RAY “FOCUS” TUBES, 25s. 
FLUORESCENT SCREENS, 638s. and 90s. 
Complete Apparatus for Réntgen ‘‘X” Rays, with Coils 
and Fluorescent Screens, &c. 
HIGHEST QUALITY ONLY. 
Detailed List on Applic ation. 
X-RAY COMPLETE a 
i 
Pe 
Ser A. Including 3-inch Coil, our own make, Batteries, Focus 
Tube, Tube Holder, Barium-Platino-Cy: anide Screen, 
z7in. X'5 in. £13 0 0 
SET 7, Tnclraiae 6-inch Coil, Batteries, “Larger. Focus Tube, 
Tube Holder, Barium-Platino-Cyanide Screen,-ofin. x7 in. £23-10 -0 
BARIUM-PLATINO-CYANIDE SCREENS. 
EXCELLENT FLUORESCENCE, in neat Frames with Handles. 
7 in. X 5 in., 21s. ; 9} in. X 7.in., 325. 6d. 5 11}in. % g}in., 55s. 
JOHN J. GRIFFIN & SONS, L: 
22 GARRICK STREET, LONDON, W.C, 
NALDER BROS. & CO. 
_ LONDON. 
N. C. S. 
TELOMSON 
REFLECTING 
GALVANOMETER. 
5000 OHMS RESISTANCE. 
VERY SENSITIVE. 
PRICE 
£9 10 O 
Write for CATALOGUES. 
Cable Address: 
SECOHM, LONDON. 
No Ageuts in U.S.A. 
This instrument delivered Free anywhere in U.S.A. 
for +60 C.0.D. 
NEGRETTI AND ZAMBRA’S 
BAROGRAPHS AND THERMOGRAPHS. 
The Barograph is fitted i ina Mahogany Case with ‘Glass Front, as shown 
above. The Thermograph is mounted in a japanned Metal Case with Glass 
Front, for either indoor or outdoor use. The above give continuous records 
on Charts, which only require changing once a week, and are invaluable to 
invalids and others whoare unable to take daily readings of the ordinary 
instruments. Price of each, with supply of Charts for one year, £6 10s. 
NEGRETTI & ZAMBRA, 
ScIENTIFIC INSTRUMENT MAKERS TO THE QUEEN, 
38 HOLBORN VIADUCT, E.C. 
Branches—45 CORNHILL, and 122 REGENT STREET. 
