“The Metal Man,” Jack Williamson, 1928 – A Geology professor prospecting radium on the coast of Mexico is turned into the Metal Man after contact with creatures in a radioactive environment that turns flesh into metal.
Comments: Adventure tale with a horror element. Jack Williamson’s first story; a later story, “The Mental Man,” is a play on this title. Concludes with an exhortation to go to a museum “if you doubt” the veracity of the story, characteristic of a romance. Available in Amazing: The Wonder Years 1926-1935 and The Metal Man and Others, The Collected Stories of Jack Williamson, Volume One.
Author: Wikipedia: “John Stewart Williamson (April 29, 1908 – November 10, 2006), who wrote as Jack Williamson (and occasionally under the pseudonyms Will Stewart and Nils O. Sonderlund) was a U.S. writer often referred to as the ‘Dean of Science Fiction’ following the death in 1988 of Robert A. Heinlein.”