Vintage clear glass Vis-O-Glow lightning arrester, Mfg. by L.S. Brach Mfg. Corp., Newark, N.J., U.S.A., circa 1920s. This device was used as the terminal for a long wire or L-antenna downlead.

Photo by Joe Haupt published as CC-BY-SA-2.0 on Flickr.

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