Abstract: A transparent device that allows monitoring of the oil level and condition in the water jet propulsion system through means of a visual inspection. A layman can easily perform this inspection, simply by viewing the transparent thrust cone from the rear of the watercraft jet propulsion system, saving the expense and time of disassembly by a professional.

Abstract: A pneumatic outlet gate of a railroad hopper car has an valve member mounted for rotation in a discharge tube between open and closed positions. The valve member is an arcuate segment terminating laterally at edge faces. The edge faces are angled such that in the upper half of the discharge tube they always slant downwardly from the surface of the tube, while in the lower half of the discharge tube the edge faces face downwardly. An arrangement of stops and abutments prevents rotation of the valve member to a location where the edge faces could trap lading against the discharge tube. Accordingly, the edge faces are self-emptying.

Abstract: A submersible apparatus for transporting compressed gas comprising a plurality of spools, each having a central bore. A long continuous length of relatively small diameter line pipe for holding compressed natural gas is wound about each spool, so that an inner end of the pipe terminates in the bore, while an outer end of the pipe terminates at outer surface of the spool. A tank has a thin housing to store the spools vertically therein, with axis of the bores horizontally to create a continuous pathway therethrough. An inner header extends through the length of the continuous pathway of the bores and has the inner ends of the pipes connected thereto. An outer header extends the length of the tank and has the outer ends of the pipes connected thereto. A pair of access ports are provided with each located at one end of the tank to provide loading/unloading nozzles and access ways for maintenance personnel.

Abstract: A composite hull construction includes a metallic skeletal frame of truss-like configuration including a longitudinally extending keel plate, first and second side wall structures extending upwardly from opposing side edges of the keel plate assembly, and a top wall structure extending between upper portions of the first and second side wall structures. A synthetic foam shell entirely encapsulates the side and top wall frame structures and covers the interior surfaces of the keel plate assembly. The foam shell rigidly fixes the frame members in position and increases the compressive strength of the skeletal frame to prevent buckling of the side wall and top wall structures. An exterior fiberglass skin covers the side walls and the top wall to provide a water resistant covering over the foam shell and skeletal frame.