A new type of water flow indicator for transformers

The water-flow indicator herein described consists of a heavy cone-shaped metal plunger floating in a circular orifice. A change in the amount of water flow demands a corresponding change in the free area of the orifice and this is obtained by a vertical movement of the plunger in the orifice. This movement is transmitted through a bell crank and shaft to an external pointer which moves over a scale, calibrated in gallons of flow per minute. A number of these indicators has been in successful operation in several different states since the summer of 1920.