This is an Anglo-Saxon watering can which uses air pressure to keep the water in the container. It’s very clever and great fun to play with. 
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What am I playing with? My Anglo-Saxon watering can
HistorytalkerGentleman Scholar and Historian
Historytalker 
2 replies on “What am I playing with? My Anglo-Saxon watering can”
I’m not saying I’m wanting in the intellect, but I could probably play happily with that for about eight hours. What genii gardeners the old geezers were!
Yes it is a genius creation. Its simple and effective.