KNOWLEDGE. 



December. 1910. 



THE SANITAS ELECTRICAL Co., Ltd. 



Works : 



Specialists in X-Ray and all Electro-Medical Apparatus, 



61, NEW CAVENDISH ST., LONDON, W. ^. ^ .0. bent.nck mews. w. 



A NEW RANGE OF 



- ~ HEAVY DISCHARGE COILS 



FOR RAPID RADIOGRAPHY, i&c 



CilVINU 60 AllLLIAMPERKS ACROSS AN 

 8 INCH AIR GAP. 



Woii'id on the latest approved Multiple- 

 section principle. Highest efficiency and finish 

 coinI)ined with long life. 



Not a single coil supplied by us during 

 a period of nine years to date has broken 

 down or in any way needed repair. 



These coils will increase the efficiency of any 

 outfit with any Interrupter, but are specially 

 built to suit our famous "Sana-v" Interrupter, 

 in conjunction with which they represent the 



highest attainment in X-ray technique. 



Absolutely steady It'sht of intense 

 brilliancy for screen examinations. 



Times of exposures for radiography 

 reduced to the absolute minimum. 



Perfect control and regulation for 

 Therapeutic treatment. 



THEY ALSO FORM THE 



IDEAL COMBINATION 



SCIENCE WORK. 



"SANAX** INTENSIFIED COILS are wound specially for any voltage from i:j-35o \ . F.-r use uiih McrLUiy 

 Interrupters, Kle.ln.ivU' I iii.rni|ir- i s, > •\ with Variable Primary for use with both types alternately. Of any spark length, 

 .ukI mounted in ariv 'm.umer. iml thc-y are only manufactured in one quality. We do not manufacture SeCOnd-rate 



Coils, the so-called Commercial Type, which are not worthy a place In Medical or Physical Science. 



"SANAX* 



MOTOR MERCURY INTERRUPTER (Patent). Entirely new centrifugal principle. From 

 1' s Mic ],qiidii\ 1^1 iIk- \\'ehnelt (without its reverse current and other 



llic.ik : i!<-.\r .''i/ow ,'^-t.i!fi.-,L No muddying of mercury for a year 



Uplh 



drawbacks) with the efticiencN of the ,M 

 or longer, therefore its remarkal>le 

 efficiency is constant. 



Produces the most intense discharges 



from any co 

 respects. 







Perfect control in all 



NO Pumps. 

 NO Jets. 

 NO Hammers. 

 NO Paddles. 

 NO Magnets. 

 NO Dippers. 



Only a Revolving Segmented 

 Disc, rotated by the 

 centrifugal ly-d riven ring 

 of mercury. 



N/WWVXi^ 



o,oe?^ tfi-c. 



:^j:v:^iSgS'JJiJtEWa-itfM 



The id' .1 .'.!■■ i ■ I ititerruption. Kach iiiterrujition absolutely uniform. 



I ireat rapidity as denoterl by the time in illustration. 



Taken l>v the Physical Laboratory. 



Write for Catalogues and a new book of Testimonials and Reports and Opinions of leading X ray and Scientific workers. 



HARPER S XMAS 



NUMBER NOW READY. 



SEVEN COMPLETE STORIES ot varied 

 type by Margaret Deland, Henry V'an Dyke, 

 Carolyn Wells, Amelie Rives, &c. 



SIXTY ILLUSTRATIONS jn colour and 

 monochrome by Frank Craig, Elizabeth Shippen 

 Green, F. Walter Taylor, Peter Newell, Ac. 



PAPERS ON ART, LITERATURE, &c., 



by W". D. Howells, Richard Le dallienne, 

 Christian Brinton, Norman Duncan, &c. 



JAMES SWIFT & SON, 



OPTICAL & SCIENTIFIC INSTRUMENT MANUFACTURERS, 



all Satntilic IKpai tii:cnU ol J/.M. (,.',-/. 



Gold Medals Awarded for Optical Excellence. 



IMPROVED UNIVERSITY 

 MICROSCOPE, 



W nil 1 111. anil \ in. or i in I )li- 

 jeclives, one Ocular anfl Iii^ 

 Diaphragm, in Cabinet. £9 10 0. 

 I'iiiocular arrangement, e.vtra. £2 12s. 

 Patent Mechanical Stage, £2 10s. 



An Ideal Instrument for Professional 

 or Amateur. 



UNIVERSITY OPTICAL WORKS 



81, TOTTENHAM COURT RO.. LONDON. 



