| 31. | Because the light signals were tripped during his performance, Valiantine did not collect the award.
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| 32. | A light signal fades after 250 to 375 miles.
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| 33. | Another light signals if the user has unread e-mail.
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| 34. | Both signalboxes control a mix of semaphore and colour light signals with mechanically operated points.
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| 35. | This clock measures the time of day, primarily based on input from outside light signals.
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| 36. | But at journey's end, these light signals must be processed and converted to electronic signals.
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| 37. | At level crossings Athens Tram uses special light signals which are coordinated with road traffic lights.
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| 38. | Within Class Delta AGL low approach with " tailhook " extended and observe tower light signals.
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| 39. | Wang's experiment uses another property of light signals.
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| 40. | Today, only electrically operated light signals are used.
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