The accompanying sketch shows the details of a revolving teeter board for the children's playground that can be constructed in a few hours. Secure a post, not less than 4 in. square and of the length given in the drawing, and round the corners of one end for a ring. This ring can be made of 1-in. strap iron and it should be shrunk on the post. Bore a 3/4-in. hole in the end of the post for the center pin to rest in. Make three washers 3-in. in diameter and 1/4 in. thick and drill 3/4-in. holes through their centers. Drill and countersink two smaller holes for 2-in. wood screws in each washer. Fasten one of these washers to the top of the post as shown. The post is now ready to be set in the ground. Coarse gravel should be packed tightly about it to make it solid. Concrete is much better if it can be secured.
Details of Teeter Board
To make the swivel you will need two 1/4 by 5 by 8-in. plates, rounded at the top as shown, and two wood blocks, A and B, each 3-1/2 by 5 by 10 in. Drill the lower ends of the plates for four 2-1/2-in. lag screws and the upper ends for a 5/8-in. bolt. Fasten the plates to the block B, then drill a 3/4-in. hole as shown and fasten the two remaining washers to the block, one on each side and central with the hole. Bore a 5/8-in. hole lengthwise through the block A for the 5/8-in. rocker bolt. This bolt should be 11-1/2 in. long.
The teeter board is made of a 2 by 12-in. plank about 12 ft. long. It should be slightly tapered from the center to the ends. Two styles of hand holds are shown, but the one on the left is the one most generally used. The handles are rounded at the ends and are fastened to the board with lag screws or bolts. The block A is fastened to the board with lag screws and should be a working fit between the wo plates where it is held by means of the 5/8-in. bolt. The center pin is 3/4-in. in diameter and about 9 in. long. --Contributed by W. H. Dreier, Jr., Camden, N. J.