PACS:01.50.My, 45.20.df (all) DOI:10.1070/PU1960v003n01ABEH005843 URL: https://ufn.ru/en/articles/1960/1/h/ Citation: Malov N N, Orlova N P, Selivanenko N E, Fedotov I I "Some lecture demonstrations for a Physics course" Sov. Phys. Usp.3 167–168 (1960)