A core catcher for use with short gravity-type core barrels is described. A flat plate at the foot of a pair of pivot arms is caused to swing under the bottom of the core barrel after the barrel is withdrawn from the bottom. A float-weight lever arm is employed to actuate the device.
Glezen, William H.. 1957. "An external core catcher for oceanographic work." Journal of Marine Research 16, (1). https://elischolar.library.yale.edu/journal_of_marine_research/882