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Rectifier.
An example of the element Selenium

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Rectifier.
Before the invention of silicon and germanium rectifiers, these were state of the art. Despite being called "miniature" rectifiers, they are huge by current standards!
Source: Charles Cowie
Contributor: Charles Cowie
Acquired: 9 September, 2002
Price: Donated
Size: 2.5"
Purity: >90%
The Elements book Mad Science book Periodic Table Poster  Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here!