Retro weapons - Ray Gun

Before the discovery of atomic energy, sci-fi weapons generated an unspecified death ray: the technology at that time was not sufficiently developed to scientifically support the fantasies of writers and screenwriters.
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I'm a big fan of Fallout game series and I've always loved its retro-futuristic design. I'm trying to put together some blueprints of retro weapons myself, maybe if they look cool enough I'll hang a print or two in my home ;)