back-acting

“I'd get you one if it cost a thousand dollars -- a double-patent, back-acting, spontaneous od-electro rubbing machine, "petulently grumbled the master.”

The Story of a Slave. A Realistic Revelation of a Social Relation of Slave Times--Hitherto Unwritten--From the Pen of One Who Has Felt Both the Lash and the Caress of a Mistress