The works of the temple moved on with astonishing rapidity, and on the 23rd of September the first capital was put up.
The stone weighed about two tons and when the stone was at its hight, and the men were attempting to draw it to the wall, the crane gave way at the foot of the wing or angle, which circumstance caused considerable danger. By great care the stone was safely landed and set without any further accident.
[Fillerup, Robert C., compiler; William Clayton Nauvoo Diaries and Personal Writings, A chronological compilation of the personal writings of William Clayton while he was a resident of Nauvoo, Illinois. http://www.boap.org/LDS/Early-Saints/clayton-diaries]