1313133

12223242

E. face, joints in courses 6 to 9 cracked and slightly opening.
S. end, continuous crack, courses 17 to 23.

E. face, hair crack in course 14, 11" from N.E. angle.

All joint faces burst off.

S. end, cracks in courses 2 and 4, 6" from W. face.
W. face, cracks in courses 8 and 10, 4" from S. end.
N. end, hair crack in centre of course 14.

E. face, hair crack in course 6, 6" from S.E. angle.
W. face, cracks in courses 14 to 24, near N. end.
W. face, cracks in courses 1 to 10, near S. end.
S. end, cracks in courses 6 and 7.

N. end, hair crack in course 21, 3" from N.W. angle.

Pressure fell 7 lbs., but the compression continued.

N. end, vertical crack at centre extended up through course 12.
Pressure wavered slightly.

Pressure fell to 705, when there was an audible crack.

Notes

N. end split in course 4, 5" from N.E. angle.

Visible jump of wall, accompanied by sharp audible crack.
Pressure then fell to 800.

N. end, the stretcher at centre of course 16 cracked. (See note
at 750 lbs.)

Pressure fell to 800, then rose again.

N. end, a continuous crack from centre of course 11 to bottom
of wall.

E. face, irregular cracks from top to bottom at S. end.
Pressure fell to 820, and then to below 800, the cracking of
wall meantime increasing. (See photograph, fig. 8, p. 81.)
Wall crippled, and pressure somewhat rapidly applied.
Wall in worst condition at courses 18 to 20, near S.E. angle;
it then failed, the southern end falling out first. (See photo-
graph, fig. 9, p. 83.)