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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 writes that he received Meyers new book “Radioaktivität” and congratulates him. He states that he about to travel to Dalmatia and describes some experiments about ionisation of air, especially related to the determination of the ion disappearance constant. There is a part for Prof. Schweidler included in the letter. Hess asks about some details in Schweidler’s experiments. |
| Notes | – Einschlingenelektrometer: Type of electrometer used in cosmic ray studies, developed by Werner Kolhörster; https://www.fs-ev.org/fileadmin/user_upload/05_SSP/Hefte-Komplett/Komplette%20Hefte%202008-20012/ssp%204_11.pdf (retrieved 14.10.2025) – Abbreviation  : ionisation rate |
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