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