Ducking Stool, a stool or chair in which a scolding woman was confined, and set before her own door to be pelted at, or borne in a tumbrel through the town to be jeered at, or placed at the end of a see-saw and ducked in a pool.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Ducis, Jean * Duclos, Charles