A WKEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid s^ound 

 0/ Nature trusts the mitui which builds for <y,e. "-WORDSWORTH. 



No. 1408, Vol. 54] 



THURSDAY, OCTOBER 22, li 



[Price Sixpence. 



Kegistered 



tlie Ucniiral Posi Omce.l 



[All Rights are Reserved. 



X-RAY FOCUS TUBES. 



"he " Kocus" Tubes manufacuuctl by 



NEWTON & CO., 



3 FLEET STREET. LONDON, 



re still unrivalled for brilliancy and ilefinilion, and are used by 

 \tarly all the leading workers. 



Dr. J. .Macintyre, of Glasgow, in N.viURE, September lo, 

 ays that with these Tubes he has obtained " some of the best 

 (hotographic results in the deeper structures of the body.". ' ! 



In consequence of the large number of these Tubes which have 

 low Ijeen sold, it has been pnssi!)le lo reduce the price to 25s. 

 ach. Wilt) these Tubes and a 6" Coil and l-'Uiorescent Screen, 

 he beating of the heart and the movements of the diaphragm 

 :an be readily seen in an aduli. 



Fluorescent Screens, intensely brilliant, 

 8" X 5", 35s.; I"" :< 8', 63s. 



L/ST OF CO/LS, TUBES, SCREENS, ^c. POST FKEE. 



BECK'S MICROSCOPES. 



X... 25A.— THIS MODEL, with 

 I -in. and \-\n. Object Glasses, 

 Two Eyepieces, and packed 

 in I'olished Mahogany Case, 



£6 10s. 



No. 2SB.— THIS MODEL, with 

 J-in. and Jin. Object Glasses, 

 Two Eyepieces, and packed 

 in Polished Mahogany Case, 



£7 5s. 



N( 



29B. — The addition of Abbe 

 Condenser to 25B with Iris 

 Diaphragm and Focussing 

 and Swinging Adjustments, 



£8 15s. 



STAND No. 26. 



i'UI.L PARTICULARS FREE on APPLICATION to 



R. & J. BECK, Ltd., 68 CORNHILL, LOliDON.E.C. 



STI«,-ALllVEr> -visioiv. 



Distressing Headaches, Indigestion, Simulated Neuralgia, and 



Nervous Depression, are frequently caused by some peculiarity 



of the \'ision, which can at once he overcome by the use of 



proper glasses. 



(( 



OUR EYES," 



By JOHN BROWNING, F.R.A.S., F.R.M.S., 



President nf the British (Jptical Association, &c. 



(A'ort' in its Sixteenth Edition.) 



PRICE ONE SHILLING, POST FREE. 



( )r Consult, Free of Charge . 



MR. JOHN BROWNING, 



Ophthalmic Optician, 



63 STRAND, LONDON. _^ 



NEGRETTI & ZAMBRA'S 



BINOCULARS AND TELESCOPES. 



Makers of the " OFFICER OF THE WATCH" TELESCOPE, 

 in use on all the vessels of H.M. Navy. 



£2 2s. 



£2 2s. 



Length, 



upplied by NEGRETTI & 2AMBRA to the War OfTice. 



(vhen closed, ii inches. Coml)ining high power .-ind portability. 



NEGRETTI & ZAMBRA, 



SCIENTIFIC INSTRUMENT MAKERS to the QUBBN, 

 38 HOLBORN VIADUCT, E.C. 



Branches: 45 CORNHILL; 122 REGENT STREET. 



li 1 LSTBATEU PuiCF. LlSTS FkEE BY POST. 



