The overgrown remains of those very gaslamps can still be seen all down Robert's street. In other (posher) parts of the New Town of Edinburgh the lamps are still in use, although I assume they've been converted to electricity now. Here I've used photos of the lamps I saw to illustrate Robert Louis Stevenson's children's poem, The Lamplighters.
My tea is nearly ready and the sun has left the sky;
It's time to take the window to see Leerie going by; For every night at teatime and before you take your seat,
With lantern and with ladder he comes posting up the street. Now Tom would be a driver and Maria go to sea,
And my papa's a banker and as rich as he can be; But I, when I am stronger and can choose what I'm to do,
O Leerie, I'll go round at night and light the lamps with you! For we are very lucky, with a lamp before the door,
And Leerie stops to light it as he lights so many more; And O! before you hurry by with ladder and with light,