PACS:01.50.My, 45.50.Tn, 07.55.Db, 62.20.Qp (all) DOI:10.1070/PU1974v016n06ABEH004109 URL: https://ufn.ru/en/articles/1974/6/p/ Citation: Baranskii K N, Kiselev D F, Korchazhkih V V, Usagin S I "Lecture demonstration on a bench with an air cushion" Sov. Phys. Usp.16 937–938 (1974)