September 21, 1905] 



NATURE 



-TO 



LABORA TORIES AND HOS PITALS. 



For convenience in Stocktaking we are prepared to offer 



3 LARGE INDUCTION COILS 



(of 18-inch continuous spark) 

 at a VERY CONSIDERABLE REDUCTION off regular prices, 



THESE Coils will all give a very heavy spark of over the length indicated, 

 are most completely fitted, including Variable Primary and Variable 

 Condenser, Platinum Interrupter, Commutator, and Discharging Pillars, and 

 may be seen and tested at any time in our Showrooms. They are of our 

 own highest class workmanship throughout, and similar to those supplied 

 to the leading Universities and Hospitals, and giving the greatest satisfaction 

 under heavy daily work. 

 FVBTHER rAHTICULAIlS ON AFPLICATIOX. 



B I JK ngsXX \KI ^^^^'V I -l-rl actual makers of X-Ray, &c., Apparatus to the Admiralty, 

 n /\l\l» Y VYi WV^yVj Llllij War Office, Colonial Office, Indian Government, &c., 



la ROSEBERY AVENUE, & 15-21 LAYSTALL ST., LONDON, E.C. 



MARCONI'S WIRELESS 

 TELEGRAPH COMPANY, 



LTU. 



Manufacturers of 



ELECTRICAL INSTRUMENTS 



of all kinds for 



LABORATORY Z. WORK, 



of the highest degree of efficiency 

 at moderate prices. 



LABORATORIES FURNISHED 



Chemical, Physical, Biological, and all Science 



Labiiratorie'; complelely equipped wilh Benches, 



Fume Chambers, Cupboards, &c., and Scientific 



Apparatus of every desciiption. 



SliXD SPECIVICATIOS rOH OUR I'ltlCEfi. 



We also supply Sinks, Gas and Water Fillings 



specially designed for Science Laboratoiies, and 



Pure Chemicals. 



A. GALLENKAMP & CO., Vh 



19 & 21 Sun Street, Finsbury Square, LONDON, E.C. 



ILLUSTRATED PRICE LIST POST 

 FREE ON APPLICATION. 



London Office : 18 FINCH LANE, E.C. 

 Works : CHELMSFORD. 



ALSO AT 



BRUSSELS, PARIS, ROME. 



SELF-LUMINOUS 

 RADIUM SCREENS 



(GLEW'S PATENT), 5s. each. 



Always visible in the dark at a distance of many 



yards. 



Radium Screens are charming objects in the 



microscope, giving a raagnifleent display of 



Scintillations. 



F. HA^lRTsolsrGLEW, 



RaO10GRaPHER, 



156 CLAPHAM ROAD, LONDON, S.W. 



