This , of course , requires that the bowling ball be vertically lifted and conveyed against the force of gravity .
The runway is inclined such that the bowling ball rolls down the incline before being returned to the bowler waiting at the opposite end of the bowling lane .
Of course , requires that the bowling ball be vertically lifted and conveyed against the force of gravity .
The runway is inclined such that the bowling ball rolls down the incline before being returned to the bowler waiting at the opposite end of the bowling lane .