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power line across which the motor 20 is directly connected with interposition of a push button switch 92 located, as shown in Figs. 1, 3 and 5, on the frame 1 in convenient reach of an attendant stationed at the loading end of the machine. As shown in Fig. 16, the power main 90 extends to the setting arm of a selector switch 94 having the con tacts H, L and HL, and the conductor 91 extends to relays 93 and 193 which, respectively, are controlled by impulses from photo electric eyes 46 and 140 trans mitted through connecting conductors 95, 96 and 97, 98 respectively. The power leads 99 and 10th for the relay 93 are connected respectively to the contacts L and HL of the selector switch 94, and the power leads 101 and 102 for the relay 193 are connected to the contacts H and HL of the selector switch 94. Leads 105 and 106 from the relay 93 are connected to the remote ends of the axially aligned coils 47a and 47b of the magnetically actuated valve 47 for the cylinder 44, the switch 75 being interposed in the conductor 106. Leads 108 and 109 from the relay 193 are similarly connected to the remote ends of the coils 147a and 14712 of the magnetically actuated valve 147 for the cylinder 144, the opposite or contiguous ends of said coils being connected by a con‘ ductor 111 to the contiguous ends of the coils 47a and 47b of the valve 47, and the switch 175 being interposed in the conductor 109. Connected across the mains 90 and 91, with inter position of a manually operable switch 115, is the pri mar'y of a transformer» 116 by which the E. M. F. is reduced, say to eight volts for use in actuating the mag netic valves 47 and 147 which control the photo electric eye shifting cylinders 44 and 144, ‘and the magnetic valves 62 and 162 which control the slide retracting cylinders 55 and 155, said switch 115 being located adjacent the switch 94 at the loading end of the machine as shown in Fig. 3. Through conductors 107 and 110, the leads 106 and 108 are connected to the conductor 118, while a conductor 111 in continuation of the ‘conductor 119 extends to the common terminals of the coils 47a, 47b and 147a, 147b of the valves 47 and 147 respectively. The coils of the magnetic valves 62 are in series with the respectively corresponding switches Ll-L4 through conductors 117 and connected by a branch 120 of con ductor 119 in parallel across the conductors 118 and 119 leading from the secondary of the transformer 116. The coils of the magnetic valves 162 for the cylinders 155 are likewise in series with the respectively corresponding switches Hl-H3 through conductors 124 and connected in parallel between conductors 1118 and 119. A manu~ ally-operable gang switch conventionally indicated at 125 is provided with metallic segments which, under certain conditions later on described, are ‘adapted to bridge the terminal contacts of pairs of conductors 126 and 127 which extend from the ?xed terminals of corresponding pairs of switches of the groups L and H. . Operation To prepare the machine for the sorting of stockings in accordance with both differences in length and with differences in reinforced heel height, the selector switch 94 is shifted to the HL position, the gang switch 125 is set in open position, and the switches 92 and 115 are closed—all as shown in Fig. 17. With the motor 2%) now running, the conveyer is moved at a moderate linear speed, and, as each tray assumes a horizontal position after rounding the sprockets 3, a stocking is taken from the pile P and laid flat upon the tray transversely of the machine in a de?nite position determined by lodgment of its heel in the stop 30 of the tray as previously ex plained. As the tray passes beneath the sensing eyes 411 and 140, the pivot lug 25 at one side of the tray en counters the arm 77 of the switch 75 and closes the latter, and the heel stop 31) on the tray encounters the arm 177 of the switch 175 to close the latter. quence, the coils 47a and 147a of the magnetic valves 47 and 147 are energized for admission of compressed air into the cylinders 44 and 144, whereby the photo electric eyes 40 and 41 are moved inward of the ma chine from the normal retracted positions in which they are shown in Figs. 13 and 15. By affectation of the beams B and B1 from the eyes 46 ‘and 140 respectively in encountering the top edge of the stocking S and the top edge of its heel reinforcement H, current is supplied to the coils 47b and 14712 of the valves 47 and 147 which latter are thereby actuated for admission of air into the opposite ends of the ‘cylinders 44 and 144 for return of the eyes to their normal retracted positions. During the inward movements of the eyes 40 and 140 as just explained, the upstanding stud 33 of the slide 32 on the tray is shifted along its guideway by the projection 48 on the carriage 42 to a position in line with the top edge of the stocking as shown in Fig. 12, and the up standing stud 133 of the slide 132 is shifted along its guideway by the projection 148 on the carriage 142 to a position in line with the top of the heel reinforcement as shown in Fig. 14. Assume that, by the particular stocking referred to, the studs 33 ‘and 133 on the sup— porting tray were positioned to actuate the ?rst pair of switches L1 and H1 in the direction of conveyor travel as in Fig. 17 and that the coils of the valves 62 and 162 are thereby energized to open said valves for actuation of the corresponding cylinders 55 and 155 and with drawal of the corresponding slides 53 and 153 from the As a conse- 6 corresponding voids 52 and 152 in the rails 22 and 122. Thus, as the tray continues in its advance, it is released to swing downward about the pivots 26a at its front edge upon arrival of the lugs 29a at its rear edge at said voids and to drop the stocking into the ?rst recep tacle R1. In this connection it is to be noted that in Fig. 16, the switches L1-L4 and the switches H1-H3 are arranged for the sorting of stockings of four different lengths and three different heel heights. Thus in Fig. 16, the switches Ll-L4 will be actuated by the studs 33 when the latter are shifted to the positions a-d re spectively, while the switches