| 11. | If the doll's cries go unanswered, a yellow light signals neglect.
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| 12. | These give binocular vision and great sensitivity to small light signals.
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| 13. | The first electrically operated light signal system was delivered by AEG in 1924.
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| 14. | Electric light signals and crossing lights are also operated from the signal frame.
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| 15. | On the road was inculcated traffic light signals, communication on locomotives.
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| 16. | A colour-light signal existed here in semaphore days, having been installed in 1977.
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| 17. | Abergynolwyn has colour light signals, which are operated from the blockpost.
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| 18. | All signals are multiple aspect colour light signals fitted with Train stop arms.
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| 19. | Poincar?( 1900 ) analyzed the coordination of moving clocks by exchanging light signals.
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| 20. | Light signals are made using an underwater torch in dark places with reasonable visibility.
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