A \\i;r.KLV ILLUSTRATED JOURNAL OF SCIENCE.' 



' ' To the solid gronini 

 Of Nature trusts the mind which builds for aye." — Wordsworth. 



THE BEATING OF THE HEART 

 ^HE MOVEMENTS OF THE DIAPHRAGM 



!an lie seen by tlie aid of the Special "Focus' Tubes (25.V. 



ach) and the Fluorescent Screens (35.?. each) made by 



;f.\VTOX iV CO., 3 Fleet Street, London, if used with 



one of their 6-inch Induction Coils. 



NEWTON & CO., 3 FLEET STREET, LONDON, 



ji.- now ]>rtiK\red to supply the well-known " Focus " Tubes 

 manufactured by them at the reduced price of 25s. each. 



When ordering, the length of Spark to be used, should be 

 lentioned. 



All the Tubes for 6" Spark and upwards will work right 

 lirough the human body, showing the heart, liver, spine, ribs, 

 lovements of the heart, diaphragm, ^c. 



Customers can see these Tubes at work at 3 Fr.EET S 1 REET, 

 />XI)OX. 



NALDER BROS, & CO., london 



D'ARSONVAL GALVANOMETER 



Delhered Free anywheie m USA. for >t32 C.O.D. 



lH'^^ ■Write for 



CATALOGUES. 



D'ARSONVAL 

 GALVANOMETER 



rEW FLUORESCENT SCREENS, extremely brilliant, 

 8 5 , 35s. each ; 10 : 8 , 63s. each. 



lOHN J. GRIFFIN 



22 GARRICK STREET, 



& SONS, e 



LONDON. W.C. 



X- 



RAYS. ^ 



< RAY TUBES, " FOCUS " Pattern, 27/6 each. 



CHEAPER TUBE, giving excellent Pholosr.iphic results, 15s. each. 



.Mi:. .\. .\. r. >\VINTON, April i3. iS96.--"The Special Vacuum Tube 

 ou recently supplied lo me has Ik:cu tested in inj- laboratory with ver)' 

 llisfaclorv results." 



Prof. CHATTOCK, University College, Bristol — " The tube you sent 

 « W.1S an excellent one— we have not hail a better. Please send another .as 

 oonasyou are al,le. 



INDUCTION COILS. 



3-in., £9; 4-in., £12; 5-in.. £15; 6-in,, £18. 



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



Shelford BIdwell. Esq.. M.A.. F.R.S.. and others. 



Mr. AK.NOI,l>ll. UM.YliTT, r.K.I ;.S., &c. — -- The Coil gives exceed, 

 ugly good re,ults.an,l with its n-,- 1 b.a\c taken some s|ilendid, well-defined 

 badow photographs." 



Excellent definition, any Size made to Order. Sizes in stock 15X5 inches, 

 i?i. ; 7 X 5 inches, iSj. ; 3 x6 inches, 12s. M. e.ach. 



(As 



ilert). 



VERY PORTABLE 

 SENSITIVE 

 IN STOCK. 



£5^ 



NO AGENTS 



NEGRETTI & ZAMBRA, 



SOLE MAKERS OF 



JORDAN'S (PATENT) SUNSHINE RECORDER. 



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 HDLBORH VIADUCT. 

 Branches — 45 Cornhell, 



ILLUSTRATED DESCRIPTION POST FREE. 



Telephone No. 653,-!. Telegraphic Address, " Negietti, London.' 



