They also used an ingenious lamp called, I think a kudelik. It was dish shaped and a bit of dried moss served as a wick along one edge. A lump of blubber was suspended over the wick. Once lighted the blubber would drip oil into the lamp, but as the level of the oil rose, the wick was diminished and the flame grew smaller. On the other hand, as the oil was used up, the wick became more exposed resulting in a greater flame. with only minor tending such a lamp can serve for heat, light, and cooking.