The Geograph is a revolutionary seismic system involving special techniques in combining the use of FIT magnetic tape with shock wave echoes created by a weight dropping system._x000D_
The idea of- weight dropping as a- source of seismic energy is not a new,.,oxie._x000D_
Records 'indicate a pos'sihle use of falling weights as early as .1929. 'Dr._x000D_
Burton McCollum began his experiments in 1938, but it wasn't until 1951 that the method was first proven useful._x000D_
The first weight dropping crew began commercial operations in Edwards and Sutton .Counties of West Texas in 1953. By 1962, more than '40 weight drop- ping.crews have come into existence with operations in the United States, Canada, Algeria, Iraq, Argent na,Spanish West Africa, Tunisia, Qatar, Niger Morocco and Libya by most major oil companies and larger independent oil companies. .