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The
refraction seismograph in use. Harry Hancock, Senior Geophysicist, (see
AAS Review #2) records time readings
on the MD-1 as Mike Wood (borrowed from aicrew where he navigates on
photo-survey) swings the hammer. When he strikes the plate, a switch
on the hammer handle closes, starting the MD-1. Lights flash on the
panel marking the milliseconds elapsed between origin of seismic wave,
at point of hammer blow, and reception at geophone. The wave stops the
flashing, and lights left on indicate the time interval. For more information
see the back page of How Adastra
Can Serve You brochure.
Photo: Patricia Jones (PJ-001) |
ADASTRA AERIAL SURVEYS
www.adastra.adastron.com