A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



' ' To the solid ^^-ouiiii 

 Of Nature trusts the mind which builds for aj's."— Wordsworth. 



I3V1DXJCTI03V COIX^S. 



APPS' PATENTED INDUCTION COILS .^re now manufactured 



concurrently by 



NEWTON & CO.,3 I'LEET STREET, LONDOX. 



NALDER BROS. & CO., 



LONDON. 



N. C. S. 

 THOlVtSOKT 



REFLECTING 

 GALVANOMETER. 



5000 OHMS RESISTANCE. 



■X" RAY "FOCUS" TUBES, 30s. 



SPECIAL TUBES FOR FLUORESCENT SCREENS. 



Complete Apparatus for Rontgen "X" Rays, with 



Coils and Fluorescent Screens, &c. 



Ditaihl Li-t 01! Jpf/!.nlioii. 



JOHN J. GRIFFIN &. SONS, l^ 



22 GARRICK STREET, LONDON. W.C. 



VERY SENSITIVE. 



PRICE 



.^eo 10 



Write for CATALOGUES. 



CaWe Address : 

 SECOHM, LONDON. 



l\o Aa«-ul» lu r.S.A. 



NEGRETTI & ZAMBRA, 



SOLE MAKERS OF 



JCRDAN'S (PATENT) SUNSHINE RECORDER. 



X RAY TUBES, " FOCUS " Pattern, 276 



CHEAPER TUBE, giving ixctlleiu Photogr.nphic results, 15S. 



Mk. a. X. C. SWINTON, April 18, 1896.—" The Special V, 

 you recently supplied to me has been te.sied in my laboratory 

 satisfactorA' results." 



Pkof. CHATTOCK, University College. Bristol —"The tube 

 us was an e.vccllent one — wc have not had a better. Plexse send 

 soon as you .ire able." 



INDUCTION COILS. 



3in-, £9; 4 in-. £12; s-in.. £15; 6 in., £18. 

 Our own Manufacture, as supplied to " The Lancet." 



Shelford Bidwell. Esq., M.A., F.R.S., and others. 

 Mr. ARXOI.I) H. L'LI.VIiTT, F.R.G.S.. &c.—" The Coil gives exceed- 

 ingly good results, and with its use I have taken some splendid, well-deruicd 

 ^hadow photographs." 



FIL.TTOIZ.ESCX:NriT SCZIEE^S. 



ent det'inition, any Size made to Orde 

 7x5 inches, i8f. ; 8x6 in 



in stock : 

 . 6(/. each. 





New Simplified Model, 

 adjustable for any 

 latitude, and tho- 

 roughly efficient. 

 Price £1 7s. 6d. 



Sensitised Charts, 

 5s. per 100. 



NEGRETTI 

 ZAMBRA, 



Scientific Instrument 

 Makers to the Queen, 



38 HOLBORN VIADUCT. 



Branches — 45 Corkhill, 



ILLUSTRATED DESCRIPTION POST FREE. 



Telephone No. 6583. Telegraphic Address, " Negretti, London." 



