Passage: While oil was known to exist for a long time in the Subcarpathian-Galician region, it was more commonly used as an animal drug and lubricant, but Łukasiewicz was the first person to distill the liquid in Poland and in the world and was able to exploit it for lighting and create a brand new industry. In autumn of 1852 Łukasiewicz, Mikolasch and his colleague John Zeh analyzed the oil, which was provided in a few barrels by traders from the town of Drohobycz. After pharmaceutical methods and processes the purified oil was obtained and sold in the local pharmacies, but the orders were small due to high prices. In early 1854 Łukasiewicz moved to Gorlice, where he continued his work. He set up many companies together with entrepreneurs and landowners. That same year, he opened the world's first oil "mine" at Bóbrka, near Krosno (still operational as of 2006). At the same time Łukasiewicz continued his work on kerosene lamps. Later that year, he set up the first kerosene street lamp in Gorlice's Zawodzie district.  In subsequent years he opened several other oil wells, each as a joint venture with local merchants and businessmen. In 1856 in Ulaszowice, near Jasło, he opened an "oil distillery" — the world's first industrial oil refinery. As demand for kerosene was still low, the plant initially produced mostly artificial asphalt, machine oil, and lubricants. The refinery was destroyed in an 1859 fire, but was rebuilt at Polanka, near Krosno, the following year.

Question: What did Lukasiewicz continue work on?
kerosene lamps