Have a number of oak wedges made . of sufficient length to pass through the entire thickness of the chimney and project sufficiently on the outside. Place them in sets of three each, one over the other, as shown in the engraving, having the surfaces in contact straight and smooth, and black-leaded to diminish friction. Commence on the opposite side to that in which the chimney leans; cut through to the inside, insert one set of wedges, and wedge above and under them until they take a bearing. Repeat the process around the chimney, except on the lowest side, leaving spaces of a foot or more between each set of wedges. Then, by driving the centre wedge in each set inwards, as much of the chimney as rests on them is gradually lowered just at the places and to the amount required to bring it to an exact perpendicular. When that is done, brick up the intervening spaces, loosen and withdraw the wedges, and brick up in their places. This requires careful and skilful work.

Straightening Tall Chimneys