Lamps

"It was a quarter past six when we left Baker Street, and it still wanted ten minutes to the hour when we found ourselves in Serpentine Avenue. It was already dusk, and the lamps were just being lighted as we paced up and down in front of Briony Lodge, waiting for the coming of its occupant."

(Aventure I, A SCANDAL IN BOHEMIA pg. 13)

The first public street lighting with gas was demonstrated in Pall Mall, London on January 28, 1807 by Frederick Albert Winsor, and it's mechanicsm was used for building all sorts of lamps throughout the entire Victorian Era. The street gas lights worked the same way as the house gas lights where the flame from the lighted gas heated up a mantle which became incandescent and gave out light.