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of up to 48 individual air guns with different size chambers or certain air guns volumes may be clustered together. The firing of all of the array is controlled by gun controller and is usually done to within a ± 1 or 2 millisecond tolerance, the aim being to create the optimum initial shock wave followed by the minimum reverberation of the air bubble(s). Since the shuttle is magnetised, the rapid movement into the first chamber on releasing the solenoid value provides a small current that is in effect a timing signal for the firing gun that

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