All votes in the joint convention shall be taken by yeas and nays, and all elections shall be viva voce. In taking the same it shall be the duty of the secretary of the senate to call the names of the members of the senate, after which the clerk of the house of representatives shall in like manner call the names of the members of the house. Each member of the senate and house of representatives present shall be required to vote on all questions and in all elections in joint convention, unless excused by a vote of the convention.