There are two ways in which oil can be supplied from a reservoir to the burner of a paraffin blowpipe in sufficient quantity to keep up a steady flame. One method is shown by Fig. 1, the other by Fig. 2. In the latter method it would be necessary to make the reservoir rather strong, as it would have to stand a slight pressure. A little oil must first be run into the outer tube and burnt; this will warm the top of the reservoir and force the oil up the tube and through the small jet. The oil will vaporise in the hot tube and burn there, while a little escaping through the small holes in the inner tube into the outer tube will also burn there, thus tending to keep the pressure up. In the method shown by Fig. 1 the flow of oil is regulated by a tap; the oil flows through the holes in the inner tube (the top of the inner tube being closed) into the outer tube, where it burns.

Fig. 2. Reservoir for Paraffin Blowpipe.