shell which in turn is enclosed between two semi spherical halves of a housing that are welded together whereby the porous shell containing the agent is permitted to roll around within the housing and dissolve in the wash water application_number US 71425796 A description as shown in fig1 and 2 the laundry ball made according to this invention features a novel spherical vessel for containing the solid cleaning particulate 6 the laundry ball generally comprises two symmetrical semispherical halves 1 2 of a housing a pair of annular plates 3 4 and a spherical porous shell 5 to be disposed between the two semi spherical halves 1 2 each of the two semi spherical halves 1 2 is provided with a circumferential connecting flange 11 21 at its edge the connecting flanges 11 21 further include a plurality of spaced positioning holes 111 211 the two semi spherical halves 1 2 further include a plurality of openings 12 22 formed in their walls to provide communication between the interior and exterior of the housing when the two halves 1 and 2 are assembled a structure resembling a ball socket is therefore constructed annular plate 3 is provided with a plurality of spaced dowel pins 31 corresponding in location to positioning holes 111 121 of connecting flanges 11 21 when the two halves 1 2 are assembled and annular plate 3 is positioned wherein dowel pins 31 are received through corresponding positioning holes 111.