full spool of thread 28 for immediate use by an operator a more detailed description of the cartridge 26 and the operating of the sewing machine is provided in the above referenced co pending application entitled 34 sewing machine 34 which is incorporated herein by reference the main surface of cover 25 is generally parallel to the rear surface or back wall 50 to form a housing with the interconnecting edges being generally perpendicular to back wall 50 the front edge 60 of cartridge 26 is downwardly tapered toward the needle 36 and formed integrally with the forward edge 60 at the lower end thereof is a slotted member or channel 62 in proximity to the aperture 44 formed within neck portion 42 of cartridge 26 formed adjacent the upper front edge of cartridge 26 is a recess 64 between the inner surface of upper edge 66 of cartridge 26 the perpendicular outer surface of sidewall 56 and an integral outwardly extending short wall 68 the back wall 50 of cartridge 26 is suitably cut away to provide access to the recess 64 so formed with the cartridge 26 separated or out of engagement with the recess 22 formed in the head 18 of the sewing machine extending inwardly into the recess 64 so formed from the front wall of the transparent cover 25.