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break away, because it is built from top to bottom of the building;
and the remainder of the new wall will overhang the gap above the
wall that has sunk.
7
74.
A new tower founded partly on old masonry.
7
75.
OF STONES WHICH DISJOIN THEMSELVES FROM THEIR MORTAR.
Stones laid in regular courses from bottom to top and built up with
an equal quantity of mortar settle equally throughout, when the
moisture that made the mortar soft evaporates.
By what is said above it is proved that the small extent of the new
wall between A and n will settle but little, in proportion to
the extent of the same wall between c and d. The proportion will
in fact be that of the thinness of the mortar in relation to the
number of courses or to the quantity of mortar laid between the
stones above the different levels of the old wall.
[Footnote: See Pl. CV, No. 1. The top of the tower is wanting in
this reproduction, and with it the letter n which, in the
original, stands above the letter A over the top of the tower,
626
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