The story
From the bell-shaped cross-section.
Etymology from Wiktionary, CC BY-SA 4.0.
bell pit
Today it means: A primitive mine consisting of a shaft that is gradually enlarged with a sloping roof as material is removed. Full definition →
Today it means: A primitive mine consisting of a shaft that is gradually enlarged with a sloping roof as material is removed. Full definition →
From the bell-shaped cross-section.
Etymology from Wiktionary, CC BY-SA 4.0.