Rock oil? Have you heard of it

Step Right This Way folks yes sir folks it's the petroleum Pand the Petra means Rock o means oil that's why we call it Rock oil guaranteed to cure D stomach ache fallen arches takes the sweet out of your knees you might even try it on your wagon during all this time people used only the oil which they found on the surface they knew nothing of the great wealth of oil hidden beneath the surface for their candles and oil lamps they depended on oil from sperm whales but every year sperm whales were getting scarer [Music] [Applause]