But the essence of the system is a trip wire that the racer triggers with her shins when she pushes out of the start house .
Swiss Timing uses various devices for measuring ski racers , including on - hill monitors manned by staffers .
The essence of the system is a trip wire that the racer triggers with her shins when she pushes out of the start house .
Swiss Timing uses various devices for measuring ski racers , including on - hill monitors manned by staffers .