I can try to unscrew it later when I get home. I tore down the ceiling in the basement (half of it was falling down) and uncovered this. I think I may just leave it, so 100 years from now someone can find it when the ceiling I install starts to fall down.
An old telephone protector. Could still be in service if you have a land line. The 2 red things are fuses to protect against high current. They were modified in later years with the copper straps to elimenate that function. Under the black cap are porcelins and carbons that have an air gap that protects against high voltage.
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