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Page 326

| Figure 16-15 Single-anode, multiple-tank rectifiers: (A) Cross section of one type, and (B) and (C) tank arrangement of two other types (Courtesy, General Electric Co.) |

| they can be raised or lowered. A starting or ignition anode, operated by a solenoid outside the container, is located near the center of the container. Other auxiliary anodes and grids for maintaining ignition are fastened near the main anodes. The whole unit is arranged so that all of its elements, except the mercury, can be removed for inspection or repair by lifting the cover. Two designs of single-tank, multiple-anoded rectifiers are shown in Fig. 16-14. Designs for single-anode, multiple-tank rectifiers, are shown in Fig. 16-15. |

| Water and vacuum pumps, along with gauges, valves, and controls, are mounted outside the unit. |

| Ignitrons. These are modular, single-phase mercury-arc rectifier units in which the ignition and maintenance of the arc is accomplished by electronic means. Their essential elements along with the associated control circuits are shown in Fig. 16-16. Banks on such units provide for polyphase supply and for the required capacity of rectification. |

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