Instructables
Picture of PVC Periscope
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My son came to me with an idea to build a periscope. He had found a simple project in a book which used a milk carton and two mirrors. We had a couple of mirrors, but no milk carton. So, the Dad said: "We are not going to build this toy periscope, we are going to build a real one!". 
I bought a couple of 3" PVC elbows ($2.39 ea., http://www.homedepot.com/h_d1/N-5yc1v/R-100346018/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053&superSkuId=202905035) and a 2-ft. PVC pipe ($5.44, http://www.homedepot.com/h_d1/N-5yc1v/R-202018043/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053)
I had already a couple of 3" square mirrors from Michaels (sorry, no link here).
Then I cut two slots in each PVC elbow using Dremel Multipurpose Bit 561 (good for plastic and wood). 
The rest was easy: adjust the mirrors so they are at 45 degrees and make sure you see through the periscope. Then fix the mirrors using a glue gun.
The periscope is ready!

jetich9 hours ago
Why the need to cut the elbows? The 3 inch mirrors should fit. Could i use something inside to keep them at the correct angle?
anasdad1 year ago
Great Instructable!
Ken
men lahak1 year ago
So many thanks, my first choise to serch this proyect was Instructables and i find it, this will be tomorrow homework to my cousin.
This is exactly what I was looking for. Are there any plans in the future to doing a step by step ible?
pavelanni (author)  evilspacemonkey2 years ago
I'm glad you liked this small project. Sorry, I didn't take step-by-step pictures while doing it, it seemed so simple. All I have are the photos and text above. I hope it's enough to reproduce this periscope.

But thanks for your comment, I'll keep this in mind while working on my next project.
DeesSqueeze2 years ago
Interesting. Very. I have been looking for something like this for a while. My only question - how do we download the steps?