The hanging bowls have been discussed in detail by many scholars, among them J Romilly Allen, Francoise Henry, Sir Thomas Kendrick, Rupert Bruce-Mitford, Hayo Vierck, Jane Brenan, and most recently in the authoritative study begun by Bruce-Mitford and completed by Sheila Raven (citation below).
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The hanging bowl is named after the River Witham in Lincolnshire, where it was discovered at Washingborough in 1816, along with several other articles - including a wooden canoe - in the course of drainage works.