Dave is it one of these you are talking about? Unfortunately the days of fitting to the thickness of smoke in the engineering world has almost died out. This lamp was one I rescued from the scrap bin it was just one of the many hundreds that where in use at Crewe Loco works here in the Uk that where scraped. All is not lost though a good low cost replacement you may find are a type of Paraffin (Kerosene) garden oil lamps.

The only lessons in my life I truly did learn from where the ones I paid for!