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!

<p>AWESOME instructable,<br><br>I have one question though,<br><br>I want the other end to look DOWN.<br>Want to make it for a little cousin of mine, who tries to jump up onto a wall (on the first floor) to look down at who has come at the door.<br><br>So, I want to fix this besides the wall and she should be able to see who is standing down without needing to get so high up (it is a bit dangerous as well, when she jumps up)</p>
Add another mirrored joint to the end
We made four 3&quot; ABS 90&deg; elbows and machined 45&deg; slots for the mirrors. We then hot glued the mirrors in place. 2 x 1.5' and 1 x 3' tube sections allow for reconfigurable fun! The machined slots make four great alignment which allow this to work over 6' and four reflections. Thanks for the awesome idea!
<p>awesome, so more than 2 mirrors work.! </p>
<p>I used a 2&quot; pipe and these handy, specialized 3D printed elbows to hold the mirrors.</p>
<p>Wow! It looks very hi-tech! </p>
<p>Thanks for the great project and great idea! I made it and attached it a fort we built under my sons bed. </p>
<p>Looks very cool! I hope your son likes it! :-)</p>
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?
<p>because a 3 inch square is bigger than a 3 inch circle<br><br>draw a 3 X 3 inch square then draw a 3 inch circle and place them on top of each other to see how it works</p>
Great Instructable! <br> Ken
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?
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. <br> <br>But thanks for your comment, I'll keep this in mind while working on my next project.
Interesting. Very. I have been looking for something like this for a while. My only question - how do we download the steps?

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