Abstract: A lamp housing for a motion picture projector which provides for moving the projection lamp forward and backward, up and down, and side to side, for changing the position of the lamp with respect to the focusing reflector and the film aperture. A control for automatically setting the lamp at two preselected focusing locations. Manual adjustment for moving the lamp in all three directions and remote electrical control means for moving the lamp in all three directions.

Abstract: An apparatus for continuously storing a strip of material in a coil, including a flat platter and a drive for rotating the platter, the coil lying edgewise on the platter and the strip including an incoming strip portion leading to the coil periphery and an outgoing strip portion leading from the coil center, an arrangement for applying the incoming strip portion to the periphery of the coil of the strip on the platter as it rotates, in an even number of substantially straight strip sections joined at curved corners providing alternating even and odd strip sections and applying an inward pressure to the even strip sections to form the even strip sections into concave strip sections.

Abstract: An apparatus and method for continuously storing a strip of material in a coil, such as a multi-hour motion picture theatre film. The apparatus includes a flat platter with drive means for rotating the platter, a cam mounted for rotation with the platter and having a cam track with alternating sections of greater distance and lesser distance from the center of the platter, and means for applying the incoming strip to the periphery of the coil on the platter. The applying means includes a cam follower for engaging the cam track to position the strip in a coil on the platter having inwardly directed rounded cusps with arcuate outer peripheries therebetween. In order to produce or eliminate tension in the strip, a fixed roller is positioned at the arcuate outer periphery for urging the coil inward as the roller contacts the arcuate periphery.

Abstract: A controller for a battery charger terminates battery charging operation as a function of a time derivative of measured battery voltage. The controller has analog and digital embodiments. A controller with means for determining a time derivative of the measured battery voltage, determining a change in slope of the time derivative, and using said change in slope as a control function for the battery charger.

Abstract: A magnetic tape degausser includes a pair of electromagnets which are arranged to project a magnetic field through a magnetic tape reel to magnetically erase the magnetic tape. The magnetic tape degausser includes improvements in the control of the motorized transport mechanism used to control the movement of a tape reel in rotation towards and away from erasing electromagnets. Excitation of the electromagnets is synchronized with the operation of the transport mechanism in a cooperative fashion so that the electromagnets are actuated when the magnetic tape is near the electromagnets and as the magnetic tape is withdrawn from the electromagnets. An alternative version exposes the magnetic tape to a non-uniform field as the tape approaches the electromagnets, and a uniform field as the tape is withdrawn. The speed at which the magnetic tape reel is transported away from the electromagnets is controlled so as to ensure adequate, but noise-free erasure.

Abstract: A film tensioning device for maintaining tension in the film in a film transport system such as a motion picture projector. A tension roller mounted between pressure rollers with the film running over the tension roller, with a spring urging the pressure rollers against the film to prevent slippage of the film on the tension roller. A curved spring carried within the tension roller and engageable with a stop providing sliding friction with the tension roller. The spring is readily removable for substitution of a different spring to provide a different magnitude of tension in the device.