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UER Forum > UE Encyclopedia > Drain Periscope (Viewed 5072 times) Entry: Drain Periscope originally posted by Kay O. Sweaver N. Basically a more advanced version of a Manhole Peeper, the Drain Periscope's purpose is to allow explorers to see where they are on the surface from below a manhole. This eliminates the risk of popping a manhole in a busy street or in front of a police station and also gives visual clues as to your location relative Top Side. The periscope is built using PVC or copper tubing small enough to fit through the manhole vents or grille, two small mirrors are then inserted at 45 degree angles allowing a view of the surface like a submarine periscope. If you have a sufficient knowledge of optics this can be further enhanced by adding a wide angle "fisheye" lense like on the Manhole Peeper. Modify this entry  | Remove this entry UER Forum > UE Encyclopedia > Drain Periscope (Viewed 5072 times) Add a poll to this thread This thread is one of your Favourites. Click to make normal. Click to make this thread a Favourite. This thread is in a public category, and can't be made private. All content and images copyright © 2002-2024 UER.CA and respective creators. Graphical Design by Crossfire. To contact webmaster, or click to email with problems or other questions about this site: UER CONTACT View Terms of Service | View Privacy Policy | Server colocation provided by Beanfield This page was generated for you in 64 milliseconds. Since June 23, 2002, a total of 738574384 pages have been generated.