June i, igo^J 



NATURE 



APRS, 



433 STRAND, LONDON. 



MANUFACTURER of Patented Induction Coils, other 



Scientific Instruments and Engineering Appliances 



to the Government Departments. 



JOINTLESS SECTION COILS, my sys 



4000 ohms R, very thick discharge, '. 



COMMERCIAL SERIES OF COILS, a: 



em of 1868, to order, loin. I 

 'rimary Coils for 10 to 230 vc 

 Fig., at about one-half of 1 



Slayer and Desiffner of the following Coils :— 

 POLYTECHNIC, 29 in. spark. 

 SPOTTISWOODE, 44 in. spark. 

 THE SOUTH KENSINGTON COIL, 48 in. spark. Special Coils for 



Wireless Telegraphy. 

 NEW TRIPLE-POLE MERCURY BREAK, giving a stream-like effect 



when used with Apps' Patented Induction Coil (this can be fitted to 



any Induction Coil), £6 6S. 

 HOSPITAL X-RAY SETS, complete in every detail, from £25 each. 

 The Model Apparatus adopted for South Africa, with Batteries, small 



Steam Motor, &c. SETS OF X-RAY APPARATUS suitable for 



Field Hospitals, from £50. 

 HIGH FREQUENCY APPARATUS of my newest models. 

 PRICES per return post. 



MARCONI'S WIRELESS 

 TELEGRAPH COMPANY, 



Manufacturers of 



ELECTRICAL INSTRUMENTS 



of all kinds for 



LABORATORY .tZ WORK, 



of the highest degree of efficiency 

 at moderate prices. 



ILLUSTRATED BltlCE LIST POST 

 FREE ON APPLICATION. 



London Office : 18 FINCH LANE, E.C. 

 Works: CHELMSFORD. 



ALSO AT 



BRUSSELS, PARIS, ROME. 



™3(3IfflM?™3§{^ 



Tlii 



>im^-^ 



The Autotype Company, 



74, New Oxford Street. 



LONDON, W.C. 



THE FINEST RESULTS OM 



AUTOTYPE ?lll5lg 



At the 



OPTICAL 

 CONVENTION, 



May 31 to June 3 



(At the Northampton Institute, 

 Clerkenwell, London, E.G.), 



a number of Optical and other 



Physical Instruments will be 



exhibited by 



THE CAMBRIDGE SCIENTIFIC 

 INSTRUMENT CO., LTD., 



CAMBRIDGE, ENGLAND. 



