NA TURE 



[October 12, 1905 



THE CAIFFE AUTO-MOTOR 

 MERCURY JET INTERRUPTER 



(Patented in Britain). 



NO BRUSHES, NO BANDS, NO INDEPENDENT MOTOR. 



The interruption cuts the current both for motor and coil. 

 In other words, motor and interrupter are electrically and 

 mechanically linked together. 



I*" See Nature, July 20, 1905, page 277. 



Price, including box and packing, £4 : 6 : 6 



THE MEDICAL SUPPLY 

 ASSOCIATION, 



l}vsrriptiv>- firrufar upott applicittiou. 



jrxjST i>xj:bil.ish:i3ID. 



"MZ^atson's Ne-wr I^rice Xiist of Electro - 

 'Plxex*a;pei;itic£i.l ancl Dia^n^ostic il.p]c>a.x*atus. 



The new edition is greatly enlarged, containing io& 

 pages fully describing and illustrating all standard and 

 many new instruments at reduced prices, with notes to 

 assist in the selection of apparatus. 



CORRESPONDENCE INVITED. 

 Post free and yratin on apijiication. 



SONS, 313 High Holborn, London, W.C. 



Established 1837. Bpaiiches ; 16 FORREST ROAD, EDINBURGH; 2 EASY ROW. BIRMINGHAM. 



RECENTLY 

 REMODELLED. 



Represents K and L 



types, giving- 3-5 H.P. 



and 5 H.P 



respectively. 



Immediate Delivery 



for Stock Sizes 



of Engines. 



GREAT REDUCTION 

 GAS CONSUMED. 



Up to the end of 1904, 

 over 51,000 g-as and 

 oil eng-ines had been 



delivered, represent- 

 ing- about three- 

 quarters of a million 



actual horse-power. 



DALLMEYER'S NEW TELEPHOTO LENS. 



Can be used in front of any 

 small lens without disturbing 

 plates or films which may be 

 in position. 



Can be used alone for higher 

 magnification or larger plates. 



An excellent lens for all 

 artistic photography. 



THE ADON 



Mounted in Aluminium. 



PATENT. 



Measures 3|^ ins. long, i^ins. 

 diameter, weighs 4f ounces. 



PRICE, including Solid Leather 

 Case, £3 10 O "ett. 



Illustrated Booklet with 



Specimens of Work 



FREE. 



J. H. T> A T -T -1%/r-F^^VTTg^- LTD., 25 Newman St., London, W. 



MAKERS OF THE CELEBRATED DALLMEYER LENSES. 



