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