    [United States Senate Manual, 104th Congress]
    [S. Doc. 104-1]
    [Rules for Regulation of the Senate Wing of the Capitol and Senate Office Buildings]
    [Pages 174-175]
    [From the U.S. Government Publishing Office, www.gpo.gov]

            96                             RULE XV

                            LEGISLATIVE BUZZERS AND SIGNAL LIGHTS

                    Effective May 15, 1981, the system of legislative
                buzzers and signal lights shall be as follows:
                Pre-session signals:    One long ring at hour of convening.
                                        One red light to remain lighted at
                                            all times while Senate is in
                                            actual session.
                Session signals:        One ring--Yeas and nays.
                                        Two rings--quorum call.
                                        Three rings--Call of absentees.
                                        Four rings--Adjournment or recess.
                                            (End of daily session.)
                                        Five rings--Seven and a half minutes
                                            remaining on yea and nay vote.
                                        Six rings--Morning business
                                            concluded. (Six rings with
                                            corresponding lights. Lights cut
                                            off immediately.)
                                        Recess during daily session. (Six
                                            rings with corresponding lights.
                                            Lights stay on during period of
                                            recess.)
                    Effective July 13, 1967, the legislative call system
                shall be used for alerting Members of Congress,
                Congressional employees, and visitors of enemy attack or
                other major disaster conditions. There will be two signals:
                            1. Attack warning.--Notification to all
                        occupants that the United States is under attack and
                        that there is real danger of loss of life. This
                        warning would be given by a sequence of two-second
                        sounds of the legislative bells separated by two-
                        second silent intervals. This signal would be
                        repeated for 3 to 5 minutes.
                            2. Attention signal.--Notification of peacetime
                        disasters, such as accidental presence of
                        radioactive materials or severe weather or natural
                        disaster conditions.

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                        This signal would be given by a series of 16-second
                        bell sounds separately by 16-second silent
                        intervals, repeated for 3 to 5 minutes.

                                (Where lights exist they will correspond
                                with rings.)