Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine (1914)

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CH. XIII] CURRENT RECTIFIERS 495 free from flicker the rectifier would doubtless answer perfectly in all other particulars. There is no doubt about the motor-generator; it will give perfect direct current for projection. § 685. Need of apparatus designed for the frequency used. — All alternating current apparatus is designed to work with one frequency only, that is a transformer, for example, if designed for use on 60 cycle current will not work satisfactorily on either 135 or 25 cycles. Hence, in ordering apparatus for alternating current it is necessary to ascertain and specify the frequency as well as the voltage and other particulars of the supply. This information can be furnished by the power company. FlG. 264. OSCILLOGRAMS OF 1HE ANODE CURRENTS. (Cut loaned by the General Electric Co.; made from the original photograph). Curve A Portion of the current furnished by one anode. Curve B Portion of the current furnished by the other anode. Note that from a single anode, current flows in one direction only, the mercury arc acting as a valve which prevents the current from flowing in the opposite direction. When current ceases in one anode the other anode commences to furnish the current.