Gas lamp

Peter Denton has added a photo to the pool:

Gas lamps first came to London in 1807, and the first street (in the world) to be lit was Pall Mall. At one time there were some 60,000 street lights lit by gas in London; today, perhaps surprisingly, there are still around 1,600. This is one of them in Middle Temple, that oasis of expensive tranquillity just off Strand.