Here's a handy carrying case for your movie reels. Made from 6" self-locking stovepipe, it stands 17 ½" high and accommodates 24 ordinary 200-foot reels.
After compressing the pipe until it just suited the 5 ¼" diameter of the reels, I cut it lengthwise into halves. Then I hinged the parts together, drilling the metal and using rivets to attach the hinges. On the other joint, I installed two suitcase catches, locating these to take care of the overlap.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.