Abstract: A system for communication between a computer and peripheral devices. The computer is made to generate long duration, synchronous, bi-phase binary coded electrical signals that can be shaped and amplified and then used to modulate a high frequency infrared light beam. Video and audio tape motion counts or electrical signal frequency counts can be read by the computer through the mouse port. Two pulse trains that change relative phase with a change in tape motion direction can be used to record motion counts and determine the direction of motion.

Abstract: A selected segment heating system including: means for heating a fluid; conduit means for conducting the fluid from the outlet to the return inlet of the means for heating through a plurality of areas; means, interconnected with the conduit, for moving the fluid through the conduit; gauging means for operating the means for moving to move a segment of the heated fluid in the conduit as far as the return point of the farthest area to be heated; and delay means for suspending operation of the means for moving for permitting a predetermined heat exchange to occur between the heating fluid and the air in the area to be heated.

Abstract: A sensor for measuring motion past the sensor of a non-magnetic conductive part surrounded by a non-magnetic conductive shield. The sensor consists of a bias magnet and pickup coil located outside the shield. Eddy currents are generated in the part as it moves through the magnetic field of the bias magnet. The eddy currents create an electromagnetic field around the part that penetrates the conductive shield causing the generation of secondary eddy currents in the shield. Secondary electromagnetic fields created by the secondary eddy currents induce a voltage in the pickup coil, a parameter of which is indicative of motion of the part.