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This page was expanded as part of The Great Britain and Ireland Destubathon, March 2020.

This article was created or improved during the " The 20,000 Challenge: UK and Ireland", which started on 20 August 2016 and is still open. You can help!

What is a glass cone and how was it used? — Preceding unsigned comment added by 86.16.131.2 ( talk) 07:46, 5 October 2016 (UTC) reply