Up for your consideration is this fairly rare electric arc lamp. There are no markings on this one. But if I were to guess I believe it's a Thomson Houston and/or General Electric light, just because it was found in Lynn, Massachusetts in the wild.
The inside of this fixture appears to be very fragile, not sure how complete it is. There are two swinging contactors that make and break the circuits. There are two vacuum tube, not exactly sure of their purpose, and most importantly not sure if they work. The casing is made of Japaned copper that has tarnished over the years. The ceramic isolator on the bottom is cracked. The decorative fluted bulb skirting is made of cast iron.
If this were complete it would be a quite impressive lamp. It measures 9" from the top of the hook to the ceramic connector.