The number of flat-flame gas lamps ... it was still doubtful whether lighting by incandescent gas mantles or open arc lamps was the better. At that date there were 50,900 street lamps in Paris.
A lamp should be chosen which has a tendency to “burn below;” this may usually be secured by opening the air passages to the utmost and lessening the supply of gas. The flame should burn quietly.
Four more of London's at-risk gas lamps now have listed status. London's 1,300 or so surviving gas lamps are beacons from another age. They speak to us of a Dickensian past of swirling fogs and ...