Apparatus 17 wherein the included angle of the tapering section is at least twice the angle whose tangent equals the static coefficient of {HEAD ~ friction} between the test contact member and {TAIL ~ the test probe} 
between
Apparatus 17 wherein the included angle of the tapering section is at least twice the angle whose tangent equals the static coefficient of { HEAD ~ friction } between the test contact member and { TAIL ~ the test probe }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL