respectively have a near latch 46 a far latch 48 a leftside latch 50 and a right side latch 52 which are like conventional steamer trunk latches hopper 12 also has a near vertical wall 54 a far vertical wall 56 a leftside vertical wall 58 and a rightside vertical wall 60 leftside vertical wall 58 supports the vibrator unit 28 hopper 12 also has a near inclined wall 62 a far inclined wall 64 a leftside inclined wall 66 and a rightside inclined wall 68 hopper 12 also has a bottom wall 70 vertical walls 54 56 58 60 and inclined walls 62 64 66 68 are each one eighth inch thickness aluminum plate and have seam welds along their adjoining edges walls 36 and 70 have a similar construction vertical wall 54 has an overpressure relief valve 72 for relieving overpressure in chamber 16 powder 24 is a conventional powder material or particulate material of selective density for making a smoke screen as desired as shown in fig3 hopper 12 has an intermediate partition or floor unit 74 partition 74 has a top plate 76 front and rear plates 78 80 and left and right plates 82 84 plates 78 80 82 84 have respective cantilever support rods 86 88 90 92 rods 86 88 90 92 are respectively supported by inclined walls 62 64 66 68 partition 74 forms slots 94 96 98 100 with respective inclined walls 62 64 66 68 powder 24 passes through slots 94 96 98 100 from an upper part of chamber 16 to space.