| 21. | Mercury arc valves for HVDC were, therefore, often constructed with four or six anode columns in parallel.
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| 22. | All three are produced by mercury arc sunlamps, while other lamps that simulate sunlight produce primarily UVA.
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| 23. | From the 1920s on, research continued on applying thyratrons and grid-controlled mercury arc valves to power transmission.
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| 24. | The mercury arc valves were decommissioned on 1 August 2012, ahead of commissioning of replacement thyristor converters.
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| 25. | Unlike the notation in the " See Also " section below, LVT never used mercury arc rectifiers.
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| 26. | All three are produced by mercury arc sun lamps, while other lamps that simulate sunlight produce primarily UVA.
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| 27. | See HVDC # Mercury arc valves.
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| 28. | There were various vacuum / gas devices, such as the mercury arc rectifiers, thyratrons, ignitrons, and vacuum diodes.
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| 29. | Mercury arc valves require an external circuit to force the current to zero and thus turn off the valve.
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| 30. | The DC power was supplied by mercury arc rectifier thermal power station at Basin Bridge which generated AC power.
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