Inspection related topic: Saw this in a 1930 built home. On the alley side where the overhead power enters the home. Abandoned component in the basement. Something related to knob and tube wiring?? Primarily curious. Wires to the device have no power to them. Nothing visible on the floor above.
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My WAG is an early transformer or a relay of some sort.
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Telephone system Lightning Arrestor…
https://www.reddit.com/r/HomeNetworking/comments/1bwjzhh/is_this_a_telephone_network_interface_box/
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Jeff has it, old POTS surge arrestor.
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Bingo to the old guy!
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Where’s the “Solved” banner?
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FIFY… 
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You tell me! I’m lucky to get a picture off my reporting software and get it onto this forum.
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I’ve always wondered where this mysterious “Solved” banner is. I guess its reserved for the special peeps 
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