The principles upon which a safety lamp might be constructed I stated to several persons long before... - George Stephenson Quotes from quotely.org
The principles upon which a safety lamp might be constructed I stated to several persons long before Sir Humphrey Davy came into this part of the country. by George Stephenson

The principles upon which a safety lamp might be constructed I stated to several persons long before Sir Humphrey Davy came into this part of the country.

George Stephenson