Word: neodymium
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Dates: during 1920-1929
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When he came to scrutinize Nos. 60 and 62, two metallic members of the gathering, named Neodymium and Samarium respectively, he detected a presence fainty visible between them. Bringing them further out into the open-he was working with X-rays and used delicate refining methods to isolate the two metals that he wished to examine more closely-he clearly beheld this intervening shadow. It appeared in the wavelength spectra of Nos. 60 and 62 as a line that belonged to neither yet was identical in both. Forthwith, though he had no lump of new metal in his hand...