An envelope comprising a tear strip that functions as an efficient opening means for access to the envelope contents. The wheel device allows one person to move a goal across a field without using excessive force by sliding one wheel device onto the base of each goalpost and using leverage to tilt the goal and push or pull it for a distance. A drive means driven to rotate the deflection means. Cable faults are identified by the evaluation of potential swings in current. Information on the actual circumference of the rotation member is calculated based on matching between the acquired first and second waveform data.