Geophones are the parts of the system which undergo the roughest treatment. They
are planted and picked up many times, they are flung down, run over by the trucks,
stamped into the ground by the line men. And yet, they are expected to generate an
accurate, noise-free reproduction of the earth movements. They are built to withstand
rough handling but a minimum of care on the part of the line men can help in obtaining
good quality data.