1848 E. Loomis iv. 108 To the under side of the table, a center is attached with a ball and socket, or parallel plate screws.
1907 A. 78 484 The apparatus was practically a parallel-plate air condenser enclosed in a metal box.
1989 14 Jan. 35/1 One of the relays discharges the parallel-plate capacitor while the other relay remains closed.