15. An automatic siphon tube level control device for a
reservoir subject to being filled by a water supply comprising a
siphon tube adapted to be disposed with the inlet in the water
contained by the reservoir and an outlet extending outside the
reservoir to draw water from the reservoir in a siphon action, a
valve at the outlet end of the tube for regulating the liquid flow
through the tube, the valve being arranged so that the liquid
flowing within the tube acts to close the valve, and a level
sensing, valve-actuating mechanism coupled to the valve to move the valve toward the closed position with the liquid fowing from the tube being used to close the valve to stop the
flow through the siphon tube when the water level drops to a lower level to restart the flow in the tube when the water level
rises to a higher level so as to maintain the water level between
said higher and lower levels.