exposure of uncovered skin.

Air guns are made from the highest grades of corrosion resistant stainless steel. Large chambers (i.e., greater than 1 L or 70 cu in) tend to give low frequency signals, and the small chambers (less than 1 L) give higher frequency signals.

Plasma sound source

thumbA plasma sound source (PSS), otherwise called a spark gap sound source, or simply a sparker, is a means of making a very low frequency

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