Improvements in the air pressure horns with sound tone graduation system characterized by a box subdivided into two halves or twin parts each of which has two ducts or channels and an air outlet having a common air inlet under pressure; between said two conduits in correspondence of each part are installed vibratory membranes that originate the sound in the tone that in advance has been graduated and predicted; these membranes are constituted by a diaphragm or sensitive disc and their fixation is carried out by two threaded crowns in the interior of the box which has holes as registers to adjust from the outside the adjustment of the shades that of the vibration it is convenient to obtain leaving fix this position by the action of a screw or presser. (Machine-translation by Google Translate, not legally binding)
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