Temperature-compensating liquid meter

A temperature-compensating liquid metering device comprising a supply of liquid to be measured, a liquid reservoir, a measuring chamber between said supply and said reservoir, selectively operable valve means for selectively feeding liquid to be measured along a first flow path from said supply to said chamber and for selectively draining liquid from said chamber into said reservoir via a second flow path different from said first flow path, means for controlling the operation of said valve means comprising first sensor means in said chamber responsive to an absence of liquid in said chamber at a first level determined by the position of said first sensor means for actuating said valve means to open said first flow path and to close said second flow path, second sensor means vertically spaced from and above said first sensor means in said chamber and responsive to the filling of liquid into said chamber to a second level defined by the position of said second sensor means for actuating said valve means to close said first flow path and to open said second flow path, whereby the quantity of liquid filled into said chamber and thereafter drained from said chamber into said reservoir is determined by the vertical spacing between said first and second sensor means, at least one of said sensor means being mounted for selective movement, and means responsive to the temperature of the liquid being measured for selectively displacing said movable sensor means to vary the vertical spacing between said sensors in said chamber thereby to vary the magnitude of said quantity of liquid with changes in its temperature.