Signedon tube, stamped: Macalaster, Wiggin Co.
FunctionThe target comes from a side tube that is at a 45 degree angle to the concave cathode, while the second anode is aligned to the cathode. The asbestos regenerator would restore the optimum gas pressure inside the tube.
This particular one sold for $18.00 in 1915.
ProvenanceFrom the Harvard Medical School.
Related WorksRobert G. Arns, "The High-Vacuum X-Ray Tube: Technological Change in Social Context," Technology and Culture 38 (1997): 852-890.