winds down the eyes 33 will be stopped near the center position thereof the assembly of the music box of the invention will now be described the front half 2 and the rear half 3 of the casing are held together by screws 8 when the front half 2 and the rear half 3 are assembled an output gear 18 of the music box mechanism 5 meshes with the crown gear 72 engagement between the gears 18 and 72 is maintained by the coil spring 74 accordingly even though the length between the front half 2 and the rear half 3 may vary engagement between the gears 18 and 70 is maintained to wind the music box the winding string 16 is pulled downwardly as the string 16 is pulled by means of the ring 17 the pulley 15 is rotated to wind up the drive spring of the drive spring assembly 11 when the winding string 16 is released the music box is powered by the drive spring assembly 11 resulting in rotation of the drum 12 and the playing of the tune encoded by means of the projections on the drum 12 the speed of rotation of the drum 12 is maintained constant by a governor not shown the gear 10 of the drum 12 rotates the cam gear 70 which in turn reciprocates the control plate 34 back and.