出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2010/09/27 05:21 UTC 版)
A coal hole is a hatch in the pavement (sidewalk, in US usage) above an underground coal bunker. They are sometimes found outside houses that existed during the period when coal was widely used for domestic heating from the early 19th century to the middle 20th century. In Britain they became redundant when the Clean Air Act forced a change of fuel.