{TAIL ~ A gauging device} for measuring the accuracy of the rate of taper of {HEAD ~ a tapered, arcuate brake block} at a first measuring point and a second measuring point comprising: 
{ TAIL ~ A gauging device } for measuring the accuracy of the rate of taper of { HEAD ~ a tapered , arcuate brake block } at a first measuring point and a second measuring point comprising :
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH