Electrical news and engineering . inparallel for 500 volts as desired. The 500-6 volt and 500-12 volt type generators have twocommutators, and other new features, and deliver 500 voltsfor charging the plate at one end and 6 or 12 volts for heatingthe filament at the other end, thus eliminating the necessity ofproviding a battery for heating the filament. The generatorsequipped with pulleys for belt drive are the same in construc-tion as those used with the motor-generator sets, and the de-scription preceding applies to them also. New Type Self-Cooled Transformers On acount of self cooled trans
Electrical news and engineering . inparallel for 500 volts as desired. The 500-6 volt and 500-12 volt type generators have twocommutators, and other new features, and deliver 500 voltsfor charging the plate at one end and 6 or 12 volts for heatingthe filament at the other end, thus eliminating the necessity ofproviding a battery for heating the filament. The generatorsequipped with pulleys for belt drive are the same in construc-tion as those used with the motor-generator sets, and the de-scription preceding applies to them also. New Type Self-Cooled Transformers On acount of self cooled transformers being designed onan ambient temperature of 40 deg. C, advantage of the fullrating of the transformer may not be obtained where tem-peratures are above this point. Such a case happened in asub-station of the Southern California Edison Company, sothat artificial cooling was necessary. To meet the conditions,air ducts were installed around the base of the 5000 ,Westinghouse single phase, maximum rated, self cooled rad-. iator type transformer, so arranged with openings placedbetween the radiators to direct the flow <<i air supplied by amotor driven blower. With this method of artificial cooling, these maximumrated transformers will carry 25 per cent overload continuous-ly with the same winding temperatures as at full load with-out artificial circulation of air. The transformer is provided with a hot spot temperat-ure indicator, an oil expansion tank and a high voltage tapchanger, the latter operated by a hand wheel in a convenientposition above the transformer cover. THE ELECTRICAL NEWS 4a Drying Machine for Hands and Face Tlif Airdry Corporation, of Groton, X. Y., is inanulac-turiiig a machine called Airdry for drying hands and machine consists of a white enamelled iron standard,containing a motor, fan, heating element, and an adjustable
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