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WEDGE-TYPE BORE GAUGE

The displacement of contact pin 1 is transmitted through ball 2 to rod 3 and further, through a lever system, to hand 4 of the instrument. If the gauge is turned with respect to the hole axis, the deviation of the hand indicates the amount the bore is out-of-round. If the gauge is moved along the bore axis, the hand indicates the taper of the bore.
$2192$WL,M$