the line is used to show that the monarch has granted their royal assent to a bill in order to make it become law. it is used by the clerk of the parliaments in the house of lords. it is only used after the lord chancellor with the lords commissioners, has read out the letters patent for the bill. the clerk of the crown then reads out the short title of the bill and the clerk of the parliament responds by saying the line 19 times towards the house of commons at the bar of the house. the line is also written on the paper of the bill to show that the monarch granted royal assent to the bill.