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accuracy anchor bolting anchorage axial bolt axis bolt head bolt is measured Bolt Load Determinations Bolt Load Measure Bolt Mike model BOLT PREPARATION bolt stretch bolting sys bolting systems Bureau of Mines calibration circuitry converts DETERMINATIONS By Stephen drive the transducer driving frequency driving tone burst elongation EVALUATION OF ULTRASONIC Fjtj length change loads on bolts maximum signal peak Measuring Bolt ment microsecond Mike model S-l model S-l measurement modified P2L2 instru P2L2 systems phase difference pulse-echo systems measure pulse-echo technology pulsed-phase-lock-loop system Quebec Raymond bolt gage Reflection signal related to bolt Report of Investigations resin-grouted bolting Roof Bolt Load Roof Bolt Strain round-trip travel S-l measurement device shown in figure signal velocities stability strain gages stress concentrations stress factor SYSTEMS FOR BOLT Tadolini tensioned and untensioned tion torque wrench transducer attached trigger typical U.S. Bureau ultrasonic instrument ultrasonic measurement systems updated VCO input voltage wave zero crossing