Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

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CH. XIII] CURRENT RECTIFIERS 491 FIG. 261. MERCURY ARC RECTIFIER, DIAGRAM OF CONNECTIONS. (Cut loaned by the General Electric Co.). The alternating current supply comes in at the upper part of the transformer. This supplies alternating current at 220 volts (for a no volt arc) between the points C and H. The arrows indicate the direction of flow of the current during one-half of the cycle and the arrows enclosed in circles indicate the flow of current during the other half of the cycle. Taking the time when H is the positive pole of the transformer, the current flows down this wire and over to the point A. Here the current flows through the tube to the cathode B, through the battery J (or the arc lamp situated at J) to D. It then flows to the right through E and up to G. When the current is reversed, current cannot follow this path because between A and B the rectifier tube acts as a valve, as the mercury arc allows current to flow towards B but never away from it, hence the current must flow from G to A l to B through J to D, through the coil F to the left and up to the point H. The function of the coils E and Fis to act as an auto-transformer, for without them current could flow directly from G to H without passing through the rectifier tube. In actual practice both coils E and F are wound on the same iron core.