A method of determining the rate of flow of a flowable material, particulate or liquid, through a flowable material passageway, comprising causing the material passing through the passageway to move downwardly by gravity slowing the downward movement of material as compared to free falling gravitational movement measuring the weight of material passing slowly downwardly with respect to the passageway; causing an electronic signal to be generated in response to the magnitude of the weight measuring; and connecting the electronic signal to a read out display to reflect the flow rate of material with respect to units of weight with respect to units of time.
US 6,973,843 B2
Iowa State University Research Foundation, Inc.
Shyy, Yuh Yuan and Misra, Manjit K., "Method of measuring flow rate of flowable material under continuous flow conditions, and an in-line continuous flow meter" (2005). Iowa State University Patents. 262.