Abstract: A power supply system of an electronic switching electric motor for air-conditioning devices is described, said power supply system is intended to be installed in the motor vehicles and comprises a solar panel (13), which is an integral part of the vehicle and supplies electric energy to the motor (4, 52). The electric motor (4, 52) can be further powered by the vehicle battery (54), in a way that no specific equipment is needed to convert the energy, nor converting devices are needed between the motor (4, 52) and the solar panel (13). Solar panels (13) can be used with a higher voltage output than that of the vehicle battery, in such a way as to draw the available electric energy at a voltage and current level suitable to achieve a significant decrease of the dissipation of energy in the system, with the same sections of wiring or in accordance with the known techniques of the low voltage solar panels.

Abstract: An instrument for measuring the tension of yarns--particularly weft yarns which wind or unwind forming a "balloon"--avoiding further deviations thereof, which makes use of a variable impedance, for example a differential capacitor or a variable inductor, comprising a movable component and at least one fixed component as parts of an electric measuring circuit. All the components of the instrument have a centered symmetry and a passage through their center for the yarn whose tension has to be measured, with a yarn guiding and deviating eyelet positioned in correspondence of the closing vertex of the "balloon" and fixed to the movable component of the variable impedance. The variable voltage detected on one of the components of the impedance, as a function of the tension of the yarn sliding through the eyelet, is measured by a measuring device connected to the movable component.