| 41. | The driver had two periscopes and a visor in the hull front.
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| 42. | The gunner was given a telescoping gun sight and two observation periscopes.
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| 43. | The center periscope can be replaced by a passive night vision device.
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| 44. | The ship's main periscope was sheared off in the collision.
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| 45. | Within five minutes, she was operating at periscope depth.
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| 46. | Periscope depth was soon regained but could not be held.
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| 47. | *Stephan Kinsella does not maintain the Palmer Periscope webpage.
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| 48. | Curro logged onto his Periscope to announce immediately what had just happened.
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| 49. | It has at its disposal three periscopes for observation during the day.
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| 50. | Her third salvo was thought to have sheared the periscope.
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