Three Instruments 



of particular interest to the operator of electrical apparatus. 



The Duddell Oscillograph ( Permanent Magnet type) for following 

 and recording rapidly changing currents. Robust, easy to repair, port- 

 able ; suitable for use on high tension circuits without earth connection. 



The Qrassot Fluxmeter for the exploration of magnetic fields- 

 range easily changed by the use of different search coils. Its indica- 

 tions are practically independent of the suddenness or slowness with 

 which the search coils cut the magnetic field. 



The Duddell Patent Thermo-Ammeter for the measurement of 

 small currents, as in telephone work. Takes a very small power to 

 give full scale deflection ; is extremely sensitive ; can be calibrated 

 with direct and used with alternating currents ; is portable and does 

 not require levelling. 



Write for catalogues and printed matter 



fay/or Instrument Companies 



(Cambridge Scientific Instrument Company, American Branch) 



ROCHESTER, N. Y. 



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LANCASTER, PA. 



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