Abstract: A self-correcting audio equalizer is disclosed for use in a high fidelity sound reproduction system. The equalizer (46) responds to the audio signal to provide an equalized audio signal to a sound reproducing device (28) for generating a corresponding acoustic signal. The equalizer includes circuitry (48- 58) for dynamically measuring the differences between the frequency versus amplitude characteristics of the audio and acoustic signals. Another circuit (60- 68) automatically adjusts the frequency versus amplitude characteristics of the equalized audio signal so that the measured differences are reduced. The adjustment of the equalizer thus takes place automatically and substantially continuously during normal operation of the system.

Abstract: A weighing system for weighing a vehicle such as a torpedo car containing a body of molten metal where the center of gravity of the body of molten metal may shift in an uncontrollable manner within the vehicle and which vehicle has a first group of axles at the forward end thereof and a second group of axles at the rearward end thereof with each axle having at least two wheels thereon and wherein the axles of each group are symmetrically spaced about a center through which the load is applied to the axle group. The weighing system includes first and second weighing devices. The weighing devices are located so that the first weighing device engages the wheels of a fraction of the axles of the first group of axles and the second weighing device engages the wheels of a fraction of the axles of the second group of axles.