11. Also, in 1846, two plants were built in south-west England to make blasting powder using this sodium nitrate. 12. Sodium nitrate was suitable for blasting powder , which was used in the mines and quarries of the region. 13. This is one of the first known examples of blasting powder being used for engineering purposes anywhere in the world. 14. The other Relieving Chambers were discovered in 1837-1838 by J . S . Perring, who dug tunnels upwards using blasting powder . 15. Within two years of William s return, two additional plants had been built in Devon / Cornwall to make blasting powder . 16. During the construction of the canal, blasting powder , which at the time was essentially gunpowder, was used to blast through solid rocks. 17. Ninety-two miners were killed in the explosion, which was caused by the ignition of black blasting powder , while another 44 were injured. 18. While the high school was being built, workers discovered a huge cache of blasting powder in a manhole adjacent to the construction site. 19. In 1857, Lammot du Pont solved the main problem of using cheaper sodium nitrate formulations when he patented DuPont " B " blasting powder . 20. Lindsey said that his company, Lindco Equipment and Supply, had 600 pounds of blasting powder and more than 1, 200 sticks of dynamite stolen in 1991.
