SCIENCE— ADVERTISEMENTS 



Research Laboratory 



General Electric 



Company 



THE KENOTRON 



A VERY HIGH VOLTAGE D.C. RECTIFIER 



The Kenotron, a product of the General Electric Company's Eesearch Laboratory, is a 

 rectifier providing very higli voltage direct current for spectroscope work, to operate 

 small discharge tubes and for testing the dielectric strength of insulations. It is also an 

 important part of the CottreU Electrical Precipitation Process for collecting, recover- 

 ing or cleaning fumes and gases present during chemical or metallurgical processes. 



The Kenotron depends for its operation as a rectifier upon the fact that when one of two 

 electrodes, placed near each other in a hi^h vacuum, is heated to an incandescent state, 

 current can flow across the space between the electrodes only when the incandescent 

 electrode is n^ative, i. e., acts as a cathode. 



IVjr large capacities Kenotroms may be operated in groups of four. Sudh a group has a 

 capacity of 200 milH-amperes direct current, at a maximum voltage of 100,000, corre- 

 sponding to an effective value of about 71,000 volts, a-c. (about 15 kw.). Greater capac- 

 ity may be obtained by connecting additional units in multiple with the initial set. 



For further details write our Schenectady (N. T.) Office 



.General Office 

 ISchenecta^NY 



Sales Offices ml 

 all^large . citiesj 



