We have a 100 year old house with a chimney that goes through the center of the house, through the unfinished attic and out the center of the roof. The chimney in the attic has a little lean from the attic floor to the attic ceiling. There are no cracks in the plaster walls or ceilings in the house near the chimney. The chimney that exits the roof is straight. I think I remember seeing an article in This Old House magazine quite a few years back that explained that the home builders of old tilted the chimney intentionally so that water/rain would not put our the fires in the fireplace (chimney caps were not originally placed on the chimney). Does anyone else recall this practice or article???