| This lamp is probably a combination of two or three lamps. The optics and holders appear to be of the same manufacture, the lamp itself seems more modern, and the base is potentially homemade. |
| The left knob adjusts the verticle height of the electrode and the right adjusts the horizontal electrode. |
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 | The arc is visible on a sheet of mica which is in front of a pinhole. Note the inverted image. |
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