they also used these bells to be rung for when "indians" escaped and were captured and executions. these bells are marks of genocide and a reminder of it.
Bells were like clocks on a wall (meaning now). They rang in the morning, telling all to get up. Time in missions were very regimented. Each morning would have had times telling all when to eat and hold prayer and lessons. Then the mission neophytes would go to work in whatever job they were assigned to. A mid-afternoon bell would bring all back to the mission quadrangle for a mid-afternoon meal and a rest period. Then all would go back to work. An evening bell would signify the end of the work day. All would come back to the quadrangle for dinner. Further lessons and evening prayers would end each day. Daily Mission life revolved around the ringing of the bells, controlling all for meal, work and prayer times. Other "off schedule" times (according to ring tones) may have indicated warnings or special events, like Sunday mass.
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