From the beginning of the 20th century, however, the practical introduction of submarine navigation brought about the development of new elaborate periscopes of great length and provided with an optical system of lenses, which were built into the structure of the submarine. [Please select]
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We had our outlook from several periscopes above the turret and from spy holes in the turret itself. [Please select]
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"We shall submerge until our periscopes alone show," he gave his orders. [Please select]
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Hugging the parados, messengers carried the word in both directions and presently periscopes were leveled above the parados and keen eyes were searching out the traitor. [Please select]
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