Abstract: A lockable electrical female connector for locking therein prongs of a male plug comprising a female receptacle housing wherein the housing comprises a first cavity and a second cavity wherein the first cavity is isolated from the second cavity. The lockable female electrical connector further comprises a ground receptacle member housed in the first cavity, a first electrical receptacle member housed in the second cavity wherein the first electrical receptacle member comprises a first slot; and a second electrical receptacle member housed in the second cavity wherein the second electrical receptacle member comprises a second slot. The prongs of a male plug are receive in the ground receptacle member and the first and second electrical members and are locked therein via a locking wedge member. The locking wedge member is nested between the first electrical receptacle member and the second electrical receptacle member and is traversed forward via a single knob.

Abstract: A core holder for use in the testing of a geologic core sample or other similiar cylindrical sample. An elastic rubber sleeve for receipt of a core sample is disposed in an open-ended, cylindrical cavity of an open-ended, cylindrical body. The ends of the sleeve are fitted over flanged ferrules. A cylindrical end plug is releasably locked in one end of the body with one of its ends inserted through the adjacent ferrule engage one end of the core sample. A cylindrical piston housing having a cylindrical cavity is releasably locked in the other end of the body. A cylindrical piston is disposed in the cavity of the piston housing with one of its ends protruding from an open end of the cavity and inserted through the adjacent ferrule to engage the other end of the core sample. Pressurized fluid moves the piston to apply axial force to the core sample. The sleeve is compressed by pressurized fluid to apply radial force to the core sample. Test fluid conduits are provided in the piston and the end plug.