This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
The arrangement shown in the sketch is easily made and will keep the bed covers in place. The covers are provided with eyelets, either sewed, A, or brass eyelets, B, 6 or 8 in. apart along the edge. A wood strip, C, 3 by 1 1/2in., is cut as long as the width of the bed and fastened to the frame with wire, bolts, or wedges. Screw-hooks, about 1 1/4 in. long, are turned into the strip so that they will match with the eyelets placed in the covers. Thus the covers will be kept in place when the bed is occupied, and the bed is also easily made up. - Contributed by Warren E. Crane, Cleveland, O.
Ill: The Hooks Prevent the Covers from Slipping Off the Sleeper and Keep Them Straight on the Bed