In many Catholic Churches, bells are traditionally rung at 6 a.m., noon and 6 p.m. — reminding us of the Incarnation — when the Angel Gabriel announced to the Virgin Mary that she would be the mother of the Son of God.  The bells are rung to encourage us to recite the Angelus Prayer to commemorate the Annunciation.  In Saint Peter Church all 3 of our bells peal [swing] daily for the Angelus at noon and 6 p.m.  The ringing pattern is:  three strikes, pause, three strikes, pause, three strikes, pause, then a pealing of the bells.  The pattern is formatted to remind us of the structure of the Angelus Prayer.
The Angel of the Lord declared unto Mary, and she conceived by the Holy Ghost.  Hail Mary, full of grace: The Lord is with thee. Blessed art thou among women and blessed is the fruit of thy womb, Jesus.  Holy Mary, Mother of God:  Pray for us sinners now and at the hour of our death. Amen.  Behold, the handmaid of the Lord.  Be it done unto me according to thy word.  Hail Mary ...  And the Word was made flesh, and dwelt among us.  Hail Mary ...  Pray for us, O holy Mother of God, that we may be made worthy of the promises of Christ.  Let us pray.  Pour forth, we beseech Thee, O Lord, Thy grace unto our hearts, that we, to whom the Incarnation of Christ, Thy Son, was made known by the message of an Angel, may by His Passion and Cross be brought to the glory of His Resurrection, through the same Christ, our Lord, Amen.