Abstract: A system including a heatable tube, through which a liquid flows, with at least one opening formed through an outer wall of the tube and a laser directing a laser beam through the opening to an inner surface of the heatable tube to heat the cylinder. The system may be utilized within a hot water heater. A method and a hot water heater system are also disclosed wherein the liquid is indirectly heated with a laser.

Abstract: An invention is disclosed whereby an analog audio signal are transmitted over distances through a flexible medium using electro-optical radiation as the carrier of the audio signal. The analog audio signal is never converted into a digital mode nor is the signal ever filtered. The resultant analog sound that is delivered to the opposite end of the flexible medium is 100% modulated with a de minimus amount of signal loss due to noise. Though the best mode of this invention is it's application to guitar cords, any form of audio analog input will function within this invention, whereby a bundle of fiber optic cables that are capable of a high amount reflectivity, with or without the presence of an element that increases or facilitates luminescence, will become saturated with light which varies in intensity with the amplitude of the sound. This invention concedes that safety is a predominant factor when associating electrical energy with those products that people can be in contact therewith.