Aetna Electric Co. X-ray Tube (ca. 1890s)
The small paper label on the evacuation arm reads "Pat. applied for. Aetna Electric Co. Manufacturers. " The tube is of a very early design, probably 1890s. Given the concave cathode and sloped target, I would guess that it was specifically designed to produce x-rays. The bulb (on the right end in the photo) was probably intended to counteract the variations in output that were characteristic of the early cold cathode tubes.
Size: approximately 12" long with 2 1/2" bulb diameter
Kindly donated by Ron Kathren
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