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| Title | Letter from Victor Franz Hess to Stefan Meyer |
| Original | © Fordham University, New York City, NY USA |
| Editing | ©Victor-Franz-Hess-Gesellschaft Pöllau |
| Content | Hess reports that his friends Rentschler and Marden have developed a new method for achieving very high temperatures and have used it to produce pure thorium and uranium. They found that uranium consists of two components with different melting points. He asks Meyer to send him various ore samples, possibly also ordering them from the Krantz company in Bonn, in to carry out further tests. |
| Notes | – Company Krantz in Bonn: mineral trade, founded by Adam August Krantz; https://en.wikipedia.org/wiki/Adam_August_Krantz (retrieved 13.10.2025) – Katanga Erz: mineral from the province Katanga in Belgian Congo; https://en.wikipedia.org/wiki/Katanga_Province (retrieved 13.10.2025) – Westinghouse Company: The Westinghouse Electric & Manufacturing Company in Pittsburgh, Pennsylvania, is a former American manufacturer of electrical components, generators and electric vehicles. https://de.wikipedia.org/wiki/Westinghouse_Electric_%26_Manufacturing (retrieved 13.10.2025) |