instructions, the speaker may punish them by demanding that they leave the House for the remainder of the day's sitting. For grave disobedience, the speaker may "name" a member, by saying "I name [Mr/Mrs X]." (deliberately breaching the convention that members are only referred to by reference to their constituency, "The [Right] Honourable Member for [Y]"). The House may then vote to suspend the member "named" by the speaker, for five sitting days for a first offence. In case of "grave disorder", the speaker may immediately adjourn the entire sitting. This power has been invoked on several occasions since it was conferred in 1902. In addition to maintaining discipline, the speakers must ensure that debate proceeds smoothly. If they find that a member is making irrelevant remarks, is tediously repetitive, or is otherwise attempting to delay proceedings, they may order the member to end the speech. Before a debate begins in which "many members have expressed a wish to speak" or in which allotted Parliamentary time is short, the speaker may ask honourable members for (in reality demand) Short Speeches, under which they set a time limit (at least eight minutes). At the same time, however, the speaker is charged with protecting the interests of the minority by ensuring sufficient debate before a vote. Thus, the speaker may disallow a closure, which seeks to end debate and immediately put the question to a vote, if the speaker finds that the motion constitutes an abuse of the rules or breaches the rights of the minority. The speaker selects which tabled amendments are selected for votes. Before the members of the House vote on any issue, the speaker "puts the question"; that is, they orally state the motion on which the members are to vote, and the members present say "aye" or "no". If this voice vote indicates a clear majority the result will usually be accepted, but if the acclamation is unclear or any member demands it, a division (vote in the aye and noe lobbies in which members’ names are taken) takes place; the speaker and deputy speakers do not vote. The speaker may overrule a request for a division and maintain the original ruling; this power, however, is used only rarely, usually when members make frivolous requests for a division to delay proceedings. Casting votes When the Ayes and Noes are tied, the speaker must use the casting vote.