adapted for operation by a part of the human body other than the hand, e.g. by foot

Full Title

Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand > Details > Movable parts; Contacts mounted thereon > Operating parts, e.g. turn knob > adapted for operation by a part of the human body other than the hand, e.g. by foot