Sources:

Wagner, Das Rheingold.

“Cleveland & Pittsburgh Ore Docks, Cleveland,” about 1900. Detroit Publishing Company Collection, Library of Congress, http://www.loc.gov/pictures/item/det1994000556/PP/. Photoshopped.

Detect the plaque that reads, “Built 1896 by The Brown Hoisting & Conveying Machine Co., Cleveland, O.” It is a spell’s libretto. Singing the verbs hoist and convey over a cargo of ores, it sends them into the smoky sky.