Abstract: A water leak control circuit in combination with a water heater having an inlet and a drain. The water leak control circuit simultaneously detects leaks, actuates an alarm, shuts off a water supply to the water heater, drains the heater, while releaseably maintaining the alarm activated, the water supply shut off and the heater drained, all of which is accomplished by means of leak responsive circuit.

Abstract: This invention relates to a signal system for high speed vehicles traveling along a predetermined way. In the system vehicles are controlled from the wayside through the use of incremental signals automatically provided to the vehicles as a function of vehicle passage and relative vehicle position. In addition central control is provided for such a system to allow for superimposing on the automatic wayside signal equipment a programmable speed control which allows for simultaneous provision of safe vehicle speed while establishing constant, acceleration or deceleration control over any vehicle in the system.