Abstract: Methane hydrate gas is trapped on the bottom of the sea or on the bottom of the water without releasing it into the open air. A sheet (flexible sheet) 2 is formed and is sunk on the bottom of the sea or on the bottom of the water to cover a predetermined area. The sheet 2 is spread on the bottom of the sea or on the bottom of the water to trap the methane hydrate gas inside the sheet 2 as the inside of the sheet 2 is lifted up by the buoyancy of methane gasified in the area on where the sheet 2 is spread.

Abstract: A bag silo for preparing silage is disclosed. Packings are provided on the inside of the cover flaps for good sealing. Juice emitting from green material can be easily discharged. The bag silo is also adapted to be mounted on the posts driven into the ground.

Abstract: A shielding tent wherein a frame is fixed above a window or the like, a winding device for winding up a canvas or window screen is removably fitted to this frame, sliding frames each having a groove guiding and engaging the canvas or window screen are rotatably borne at the upper ends on both ends of the frame, a bottom member removably fitted in the horizontal direction below the window is rotatably connected at the outer end with the lower end of the sliding frame which is inclined outward.As required, side plates are rotatably pivoted to the sliding frames and the frame of the side plates is removably fitted to the bottom member so that the structure may be foldable and may have a pot or the like mounted on it.

Abstract: A health promoting apparatus comprising a chair, bed or the like with a loudspeaker incorporated therein. An opening formed in the chair is closed by a pretensioned flexible sheet. The sound waves from the loudspeaker cause the flexible sheet to vibrate, said vibrations being transmitted to a chair occupant.