Mercury arc rectifier #4 pictures from a forum member:

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Tony S

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This video clip shows one of Grendel ’s mercury arc rectifier’s in action. It also shows just how beautiful and how mesmerising they are in operation. As an apprentice I would spend far too much time watching them in operation, probably why my eyesight is so bad.

https://www.youtube.com/embed/1FY3gh8froU?feature=oembed



This bulb can also be switched to thyratron mode to convert DC to AC.

DC electric railways tried to make use of this for regenerative braking but there was a problem, the speed of change over. The only way around this was to have a rectifier and a thyratron side by side connected to the supply rail via a high speed switch.

To control the inverse operation needs control grids, clearly seen below the carbon electrode in this picture.

View attachment 9457

The following pictures are of a UK made Hewitic rectifier bulb just after being unpacked from its original packing case.

View attachment 9458







View attachment 9461

© Tony S

All pictures © Grendel

 
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