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| | Encyclopedia article on Periscope [EncycloZine] (Site not responding. Last check: 2007-11-07) |
 | | In its simplest form it is a tube in each end of which are mirror s set parallel to each other and at an angle of 45° with respect to the line between them. |
 | | More complex periscopes, using prism s instead of mirrors, and providing magnification, are used on submarine s. |
 | | Products related to Periscope : books, DVD, electronics, garden, kitchen, magazines, music, photo, posters, software, tools, toys, VHS, videogames |
| encyclozine.com /Periscope (519 words) |
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