In the mid 19th century the shale was used a source of oil, and in 1847 an Act of Parliament enabled causeways, inclined planes and tramways to be built so the shale could be transported to Weymouth for processing into various petroleum-based products, including varnish, pitch, naptha, and dyes. Gas was also extracted from the shale, though like the oil it burned with a strong sulphurous smell, which limited its suitability as a domestic fuel and prevented fulfilment of a contract to supply gas to Paris for lighting.