[quote="fall_fox, post:4, topic:257955"]
I'm an alter boy, 67 year old alter server, during the week. When I ring the bells, each time I ring them three times in honor of the Trinity that is present at the Consecration.
The origin of the bells is from the large Cathedrals in Europe. The people in the rear of the church had a hard time seeing. To help them know that the Consecration was taking place, they rang the bells. It used to be that the Priest would genuflect, then he would raise the Host, then would genuflect again. The same would happen for the consecration of the Blood of Christ. The bells were to ring on each genuflection and each time the Body or Blood of Jesus were raised.
I know it is not mandatory to ring the bells but I have never been in a Catholic Church where they were not used.
This is a little thing in itself, but so many things have been done away with that would add to the reverence of the Mass.
Actually the origin of ringing bells at specific points in the Mass is twofold. First, it is to make a joyful noise to the Lord (Ps 98.4) as a giving of thanks at the miracle taking place. Second it was to alert those unable to attend Mass (slaves, prisoners, laborers) that something miraculous was taking place (the first sanctus bell was typically the largest bell a parish had in their bell tower.) It took centuries for them to morph into small hand-held bells.
The practical problem with your explanation is that some will then say "now that the Mass is in the vernacular, now that the priest faces the people, now that churches typically have far better sight lines there is no need for sanctus bells." They would be right too if indeed that was the origin for sanctus bells.