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Page 328

| Figure 16-16 (cont.) Ignitron tube: (B) sealed-off metal type. |

| that is, the formation of an arc between the anodes or from the cathode to the anode. |

| By proper control of the timing of the firing of the anodes, the mercury-arc rectifier can be made to operate as an inverter, that is, it can change dc to ac. Furthermore, it can also be used to convert ac from one frequency to another. |

| Rectifiers are used for welding purposes and for the control of motors in |

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