Signedon tube: GE
FunctionThis Coolidge tube produces electrons by the heating of a cathode filament. These electrons are accelerated by a high voltage and hit the angled anode to produce the x-rays. Due to the large amounts of generated heat, this unit has radiator fins as a cooling mechanism, which allowed for a relatively small bulb size. It could also work without a rectifier as the anode was kept cold enough not to emit electrons for an inverse current. This one is a diagnostic tube. The lead glass bowl blocks the radiation in unwanted directions.
ProvenanceFrom the Harvard Medical School.