11. Cuthbert stayed with it, working it on an increasing scale; he even introduced rock drills in 1912. 12. Known as a " rock drill ," 13. Constantinesco drew on his work with rock drills to develop a synchronization gear using his wave transmission system. 14. The need for a mechanical rock drill was obvious and this sparked research on pneumatic rock drills in Europe. 15. As well as the rock drills , the company also produced drill rigs and developed'down the hole'drill primarily for quarrying. 16. From 1902, the steam engine also drove an air compressor, which enabled compressed air rock drills to be used. 17. The need for a mechanical rock drill was obvious and this sparked research on pneumatic rock drills in Europe. 18. 1882-The rock drill was at work at East Pool, South Crofty, at Falmouth Docks and in mines in South Wales. 19. The final, 1978, Sensational Alex Harvey Band studio album, " Rock Drill " was named for and influenced by the sculpture. 20. ""'Rock Drill " "'is the last studio album by The Sensational Alex Harvey Band, which was released in the UK in 1978.
