Abstract: This invention provides an improved reading or viewing lamp that achieves extraordinary visual acuity when properly used. The lamp employs a quartz-halogen bulb together with a parabolic lens to provide a collimated beam. A light filter removes heat radiation and ultra violet radiation from the beam. A convex mirror reflects the filtered light beam to the reading or viewing area where because of the point source characteristic of the bulb and the remaining optics, the rays are substantially non-crossing and transversely coherent in the reading or viewing area. In one embodiment, the collimated beam is directed vertically and tubular light shield surrounding the collimated light beam and a cylindrical shield around the convex mirror reduces transverse radiation of light to other parts of the room. The shield around the collimated beam also provides a chimney effect which disperses the heat throughout the room to points remote from the reader.

Abstract: In a high-fidelity sound reproducing system wherein the speaker is located remotely from the amplifier and therefore the electrical signals reaching the speaker are subject to distortion from the capacitive and inductive reactance of the conductors joining the amplifier to the speaker, and further subject to pickup of hum and other forms of interference, the distortion of the signal is substantially eliminated by the use of a negative feedback network connected between the input terminal of the load and the input terminal of the amplifier and by a positive feedback network connected between the input terminal of the amplifier and the return terminal of the load, the feedback loops operating on the amplifier to alter its output in such a way that the signal applied at the terminals of the remote speaker more nearly resembles the signal applied as an output to the amplifier.