Abstract: A flexible disk pack having a pair of floppy end plates. The end plates are adapted to assume a Delta or tapered shape when they are rotated with the record pack. Each of the end plates is formed of at least two stacks of contiguous flexible disks separated by wedge spacers. The thickness and mass of the outer stack of each end plate is determined by the stiffness desired while the thickness and mass of the inner stack is selected to cause it to bend smoothly toward the outer stack allowing for pneumatic stability during partitioning.

Abstract: Improved flexible disk pack magnetic storage systems and associated elements are illustrated as adapted for pneumatic partitioning and indicate, among other features, the use of spacer segments in the gap between adjacent flexible disks these being pre-attached to each disk to isolate the axial pressurized air streams from non-selected gaps and also to provide a reference surface for registration of the disks in the course of compressing the stack together.

Abstract: Improved flexible disk pack magnetic storage systems and associated elements are illustrated as adapted for end-wise pneumatic partitioning and indicate, among other features, the use of "rim type structure" in the gap between adjacent flexible disks and surrounding holes therein, to better isolate the axial pressurized air streams through such holes from "non-selected" gaps and also to provide a reference surface for registration of the disks in the course of compressing the stack together; this "rim means" including "annulets" surrounding the holes not communicating pneumatically with a given gap and "semi-annulets" partly surrounding other holes which are in pneumatic communication with the gap--and wherein such holes are circular except for the "in-communication" holes or orifices which are preferably enlarged by a "crescentic cut-out" opposite the respective "semi-annulet".

Abstract: Improved flexible disk pack magnetic storage systems and associated elements are illustrated as adapted for end-wise pneumatic partitioning and indicate, among other features, the use of "rim means" in the gap between adjacent flexible disks to better isolate the axial pressurized air streams from non-selected gaps and also to provide a reference surface for registration of the disks in the course of compressing the stack together.

Abstract: Improved flexible disk pack magnetic storage systems and associated elements are illustrated as adapted for end-wise pneumatic partitioning of a pack of flexible record disks and indicate, among other features, the use of "isolation packs" flanking the record pack to better isolate it, and especially the outer record-disks, from an outer pair of end-plates between which the isolation packs are disposed, the size and composition of each isolation pack being optimized and the gaps between isolation disks preferably coupled, pneumatically, to prescribed record-gaps and varied in height, with "large" isolation gaps coupled to "record-gaps" that are more difficult to partition.

Abstract: An improved intermittent drive for a motion picture film projector having a film gate, condenser lens, light source and shutter means is provided by a relatively large sprocket wheel having forty sprocket teeth with 12 to 14 teeth engaging the film at the sprocket holes. This sprocket wheel is driven by a servo motor capable of rapid start and stop and high-speed motion under electronic control. The sprocket wheel supports the film between the film gate aperture (light gate) and the condenser lens. The sprocket wheel is of sufficiently large diameter so as to provide a circumferential curvature that does not appreciably change the vertical plane of a single frame of film thereon.

Abstract: A multitrack recording head having a pair of ferrite combs whose teeth are separated at their tips by nonmagnetic gap spacers and whose bases are in abutting relationship. Each tooth of one comb has a wire coil for electrically transmitting signals to or from each track of the head.