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...reported by Wells to the medical society in [[Boston]] already in December 1844, this new method was not immediately adopted by other dentists. The reason ...ous oxide has been used for [[anesthesia]] in [[dentistry]] since December 1844, where [[Horace Wells]] made the first 12-15 dental operations with the gas

...s Lyell]] in the explosion at the colliery at [[Haswell County Durham]] of 1844, but their conclusions were ignored at the time. ...to mine galleries, watering workings and ensuring efficient [[ventilation (architecture)|ventilation]] of all the workings.