National Geographic : 1940 Aug
The National Geographic Magazine Natural Gas, Roaring from Its Mile-deep Prison, Mushrooms into Flame At dusk this well near Sissonville was "shot" to increase the gas flow by exploding 60 quarts of nitroglycerin at a depth of 4,876 feet. Flying gravel, forced out of the well at terrific speed, struck the top of the metal rig, causing sparks which ignited the gas. A moment later another blast of sand extinguished the flames (pages 147 and 156). "You see that only once in ten years," said the foreman. Natural gas is stored by Nature in vast pockets deep within the earth. Tapped by drilling, it flows steadily from the wells and through pipes to home and factory.