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.
This gate is suspended from a horizontal bar by chains, and swings freely about a 1-in. gas pipe, placed vertically in the center of the gate. The chains are of the same length, being fastened equidistant from the pipe, the upper ends farther out than the lower. The distance depends on the weight of the gate and the desired force with which it should close. Any of the numerous styles of latches can be used, if desired. - Contributed by Kenneth Osborn, Loveland, Colo.
Ill: The Gate will Swing in Either Direction and Come to a Rest Where It Closes the Opening