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Actually, the bit at the beginning of this article I think is wrong. As I understand it, the original tumblers did not fall over and spill their drink; rather, when in a carriage, they rolled and retained their drink rather than slop the drink out the side or topple over. — Preceding unsigned comment added by 62.255.208.42 ( talk) 13:36, 3 January 2017 (UTC) reply

@ Username:I agree this opening statement is incorrect. I have a source that cites an 1896 New York Times article that supports the claim it was designed to return to an upright position when dropped. Birdeaux78 ( talk) 23:03, 29 March 2018 (UTC) reply

Citation number 4 "Greens Steel" used for much of the history is poor quality. It is not an independently verifiable source and is an uncited blog post from a for-profit steel tumbler company. The article also says they are theories and they are reported as fact in the article. Also, flat surfaces existed in the medieval era. Raccoonny ( talk) 02:08, 30 April 2024 (UTC) reply

The following Wikimedia Commons file used on this page has been nominated for deletion:

• Glass tumbler.jpg

Participate in the deletion discussion at the nomination page. — Community Tech bot ( talk) 01:44, 26 December 2018 (UTC) reply