1 | The periscope bobbed up behind him. | |
2 | Now you can keep your boat at periscope depth all day long! | |
3 | I still need to find more pics of the thing with it's periscope. | |
4 | At periscope depth it can be located by the enemy's reconnaissance aircraft. | |
5 | A viewing instrument such as a periscope, microscope, or telescope. |