The gas supplied to the gas supply tube 7 reaches the grooves 16, taking paths or passages branched from the center of the gas supply tube or passage 7, and diffuses along the grooves 16 in {HEAD ~ the axial direction} of {TAIL ~ the stress detection mechanism} 5 and is then ejected outside 
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The gas supplied to the gas supply tube 7 reaches the grooves 16 , taking paths or passages branched from the center of the gas supply tube or passage 7 , and diffuses along the grooves 16 in { HEAD ~ the axial direction } of { TAIL ~ the stress detection mechanism } 5 and is then ejected outside
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