Introduction: How to Make a Periscope ! / Tutorial / DIY
https://www.youtube.com/watch?v=Pb24i2mru7c&feature=youtu.be
Step 1: To Do a Periscope You Need!
In today's instructables I'm going to show you the idea of how to make a periscope.
Step 2: Periscope Is One of the Simplest Optical Appliances, Which Can Be Made at Home.
Step 3: It Is Convenient for Watching Through the Crowd at Races and Competitions.
You may observe sea nature without coming up to surface.