The Linesman shall, under the supervision of the Referee, mark the distances gained or lost in the progress of the play.
He shall remain on the side-lines and be provided with two assistants, who shall remain outside the field of play and who shall use, in measuring distance, the rope or chain mentioned in Note under Rule 1 (d)
The Linesman shall, under the direction of the Referee, also keep the time, and he should use a stop-watch in so doing. He should start his watch not when the Referee blows his whistle, but when the ball is put in play.
The Linesman must penalize a side for the ends being off-side on a kick, for tripping of ends after a kick, and for roughing the full-back. It should be his special duty to be in position to see that the ends are on-side when the ball is put in play in a scrimmage. In case the Linesman gives a decision against one side and the Umpire against the other on the same play, the penalties being other than disqualification, the ball shall be brought back to the point where it was put in play and played oyer again, the number of the down and the point to be gained for first down remaining the same. In case of disqualification by either official, at any time, the disqualification shall stand. In case the Linesman and Umpire each signal a foul against the same side during the same scrimmage (unnecessary roughness excepted) only one penalty shall be given, viz.: that for the foul committed first. In case it is impossible to say which foul occurred first the penalty shall be exacted only for the foul noted by the Umpire.
In the above cases a foul called by the Referee shall be judged the same as if called by the Linesman. That is, in case more than one foul is called on the same play, one foul being against one side and the other against the other, the ball shall be brought back as stated above. In case more than one foul is called upon the same side and it is impossible to say which foul occurred first, then only one penalty shall be exacted, a decision by the Referee taking precedence over that of the Umpire and that of the Umpire over that of the Linesman.
The Linesman shall notify the captains of the time remaining for play, not more than 10 nor less than 5 minutes before the end of each half.
NOTE - There is no objection to the Linesman giving approximate time to an inquiring captain at any time during the game. He may not, however, be asked for this time more than 3 times within the last 5 minutes of the half.