A current indicator, consisting of a confined submerged biplane-shaped drag and a device for reading the angle made by the suspending wire with t he vertical, is introduced in t heory and practice. It was designed for rapid determination of current velocities and directions at any depth from a vessel an chored in shallow water. A number of calibration runs made with t he Drag and with a von Arx Current Meter indicate that the Drag is reliable and suffi ciently accurate for the purpose for wluch it was designed. The gear proved to be rugged, easy to use, and inexpensive. It requires little time to make a number of observations from the surface down to 50 feet.
Pritchard, D. W., and Wayne V. Burt. 1951. "An inexpensive and rapid technique for obtaining current profiles in estuarine waters." Journal of Marine Research 10, (2). https://elischolar.library.yale.edu/journal_of_marine_research/744