Abstract: A reticle for a projectile weapon aiming apparatus including a plurality of aiming marks, the plurality of aiming marks include a first mark positioned at the center of the reticle and at least one additional mark spaced below the first mark along a vertical center axis of the reticle, wherein adjacent marks of the first mark and the at least one additional mark are spaced apart by predetermined distances. First and second horizontal stripes are provided on each side of the plurality of aiming marks respectively, the first and second horizontal stripes offset relative to the vertical center axis with a gap provided therebetween and extending towards the perimeter of the reticle, the first and second horizontal stripes spaced a predetermined distance from a bottom of the reticle measured along the vertical center axis.

Abstract: A reticle for a projectile weapon aiming apparatus including a plurality of aiming marks, the plurality of aiming marks include a first mark positioned at the center of the reticle and at least one additional mark spaced below the first mark along a vertical center axis of the reticle, wherein adjacent marks of the first mark and the at least one additional mark are spaced apart by predetermined distances. First and second horizontal stripes are provided on each side of the plurality of aiming marks respectively, the first and second horizontal stripes offset relative to the vertical center axis with a gap provided therebetween and extending towards the perimeter of the reticle, the first and second horizontal stripes spaced a predetermined distance from a bottom of the reticle measured along the vertical center axis.

Abstract: A reticle for a projectile weapon aiming apparatus including a plurality of aiming marks, the plurality of aiming marks include a first mark positioned at the center of the reticle and at least one additional mark spaced below the first mark along a vertical center axis of the reticle, wherein adjacent marks of the first mark and the at least one additional mark are spaced apart by predetermined distances. First and second horizontal stripes are provided on each side of the plurality of aiming marks respectively, the first and second horizontal stripes offset relative to the vertical center axis with a gap provided therebetween and extending towards the perimeter of the reticle, the first and second horizontal stripes spaced a predetermined distance from a bottom of the reticle measured along the vertical center axis.

Abstract: A mobile, self contained system and process for removing debris and dust from the interior of ductwork without use of rotating shafts or cables. A mobile housing and equipment unit may have a plurality of wheels which can be easily removed. Within the housing a vacuum source, debris collection plenum, air compressor and associated structures are disposed. The vacuum head has an air hose attachment point, a turbine or other pneumatic drive, a vacuum intake, and a rotating brush powered by the turbine/pneumatic drive. A first compressed air feed hose supplies compressed air from the compressor to the turbine, thus providing power to agitate or rotate the brush. A vacuum hose withdraws air from the vacuum head, thus entraining and removing debris and dust. A second compressed air feed line may supply compressed air to the turbine to drive the (reversible) turbine in the opposite direction.

Abstract: There is provided a process for the manufacture of 2-(4-chloro-2-methylphenyl)imino-1,3-dithietane which involves the reaction of a dithiocarbamate salt with a methylene halide in the presence of a base and a sulfide ion in the presence of a ketone solvent to obtain high yields and purity of said 2-(4-chloro-2-methylphenyl)imino-1,3-dithietane.