| 1. | Fortifications were improved and a new system of visual signalling introduced.
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| 2. | At this time her pennant number was changed to I72 for visual signalling purposes.
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| 3. | At this time her pennant number was changed to I77 for visual signalling purposes.
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| 4. | Visual signalling posts and relay posts for runners were prepared and messenger-pigeons taken forward.
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| 5. | Visual signalling still failed again during the attack, due to mist, dust and smoke.
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| 6. | At the end of May her pennant number was changed to I76 for visual signalling purposes.
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| 7. | visual signalling . this is limited by line of sight and visibility, which may be poor.
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| 8. | In open warfare, visual signalling ( employing signal flags and the heliograph ) was the norm.
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| 9. | The primary types of visual signalling were Semaphore flags, lamps and flags, lamps and lights, and the heliograph.
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| 10. | They had also to learn visual signalling, first aid and artificial respiration, and pass a swimming test, covering fully clothed.
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