Book 3 — Desk-Light Arm Folds into Pigeonhole

This Desk Lamp and Holder Folds Up into a Pigeonhole When Not in Use

The extension arm for an electric lamp shown in the illustration was made of strips from steel building toys. I installed it in my writing desk, and fastened it with one screw to the back of the desk inside the pigeonhole. When collapsed the arm measures 7¹⁄₂ in. from the fastened end to the front end of the socket, leaving only the globe protruding. Extended, it measures 16¹⁄₂ in. The lamp cord is taken through a hole in the back of the desk. If a very rigid arm is wanted, the strips can be doubled. I used screws with two nuts, but rivets can be used also, leaving the joints to move freely. The sliding feature at the inner end adds about 2 in. to the length of the arm when extended.—A. J. Viken, Waterloo, Ia.