Abstract: A capacitive relay takeoff swimming platform sensor system including multiple stations, timing devices and capacitive sensor devices where the presence or departure of a second swimmer on a relay takeoff swimming platform is sensed by the change in capacitance of a sensor mat and compared to the arrival of a first swimmer at a touchpad sensor. The system includes automatic recalibration of sensing, such that presence of a swimmer is sensed and then system recalibrated so as to detect departure of the swimmer. The sensor mat includes an polycarbonate perimeter.

Abstract: LED Christmas tree for drag racing starting and timing having light emitting diode signal lights arranged on an upper display tier and on a lower display tier.

Abstract: A submersible, touch-operated signaler including at least a pair of facially confronting, electrically conductive plates. Strips of resilient, nonconductive material are interposed between the plates to maintain a substantially preset spacing therebetween and to yieldably resist movement of the plates toward each other. The strips are disposed in a plurality of vertically aligned and spaced rows with vertically aligned fluid-draining passages therebetween. Rigid edge containment brackets along adjacent margins of the plates secure the edges of the plates against movement away from each other. Openings extend through a rear electrically conductive plate which align with the vertically oriented passages between the resilient strips to provide free vertical fluid flow into and out of the space between the plates. The touch-operated signaler operates on low voltage.