This is a grapnel rocket launch kit for use with U.S. Navy rockets for throwing lines. The kit was developed by inventor Wadsworth W. Mount for the purpose of throwing life lines for rescue work at sea or from ship to shore as life saving rockets and used standard U.S. Navy 1.25-in.and 3.25-in. rockets. The rockets were also to be used to climb cliffs and for breaching beach defenses.
Successful tests of these rockets were conducted from 1944 to 1946. However, Mount's rockets were not adopted by the military services. The kit was donated to the Smithsonian by Mount in 1976.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.