Anode and Cathode: 1937 WL

A science teacher at the coffee shop tried to explain how two different metals (in this case: aluminum and steel) can fuse together by a chemical (and somewhat electrical) reaction.  Similar to how a hot water heater aluminum anode will accept the corrosion of the interior of the tank.  I know "galvanic" was a word he used . . . anyway - this thing is like a solid block of multiple metals.

Photo Above:  "The guy said it ran last year."

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I researched, and they only made about 570 1937 WL models.