| 11. | A hydrophone is a listening device-does it need more skill than ASDIC?
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| 12. | ASDIC was effective only at low speeds.
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| 13. | Hedgehog solved one of the most pressing problems, keeping ASDIC contact at short ranges.
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| 14. | It was expected from British work on ASDIC that other nations would develop something similar.
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| 15. | He afterwards worked in Fairlie, Scotland, doing research on ASDIC for the Admiralty.
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| 16. | Unable to see anything in the darkness, they dropped ASDIC and the was sunk.
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| 17. | Two more depth charges were dropped when a weak ASDIC contact was regained at 0045.
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| 18. | I don't think they would mention ASDIC by name because it was secret.
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| 19. | Hedgehog allowed the target to be attacked while within the usable range of the ASDIC equipment.
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| 20. | They also could not use asdic, as it frightened them and lead to protracted chases.
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