History: Tin can used as a flotation device in a 1930s swimming class at the Domain Baths in Sydney, Australia [1400 x 1071]

https://i.redd.it/b0khf529nl0y.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/5fk75j/tin_can_used_as_a_flotation_device_in_a_1930s/?utm_source=ifttt