244 REPORT OF THE CALIFORNIA EARTHQUAKE COMMISSION. 
Deformation of the U. 8. Government buildings. — For the purpose of determining the 
extent of the deformation of the three U. 8. Government buildings — the new Post-office, 
the Appraisers’ Building, and the Mint — the Coast and Geodetic Survey, at the request 
of the Commission, determined on July 12, 1906, the relative levels of the four corners of 
each of these structures, as indicated in the accompanying notes and figures. The level- 
ing was done by Mr. C. H. Sinclair. The memorandum of Mr. Sinclair’s results, which 
was placed at the disposal of the Commission by the Superintendent of the Coast and 
Geodetic Survey, is as follows: 
New Post-office. — Fig. 52 shows by numbers the positions of the stations occupied; 
and the points at the corners, the relative levels of which were determined, are indicated 
by their orientation. 
The southwest corner is the lowest and is the only one that settled materially, being 
about 0.393 foot =4.72 inches lower. The outer walls have cracks in many places. 
This is a fairly good showing for a bad foundation. 
Sights nearly equal except at II, where backsight is about 100 feet and foresight is 
about 300 feet. Street so low that readings could not be made any other way. Cars 
and drays passing all the time. Wind bad. Rod held on circular molding (tower, 
4 circle section) which was the lowest projection built into the wall that was common 
to the four extreme corners. 





Held rods 
Ruins 
zit re 
P teen i, Wee 3.426, Stevenson St. LeveL at—| Corner. DIFFERENCE. 
I NE. 0.024 
i SE. 
/ 
/ II SE. 0.409 
| SW. 
4 Ue 
Sats III SW. 0.400 
=> ik NW. 
\ 
\ 
Ly NW. 0.000 
NE. 


1984\, 
307% 
Mission St. ~~=—_ / 
ae | Ruins te 
Fic. 52.— Map showing relative levels of four corners of 
new Post-office, San Francisco. 

Appraisers’ Building. — Fig. 53 shows by numbers the position of the stations occu- 
pied; and the points at the corners are indicated, as before, by their orientation. 
The northwest corner is 0.909 foot = 10.908 inches above the southwest corner. The 
northeast corner is 0.909 foot + 0.054 = 0.963 foot = 11.556 inches above the south- 
west corner. The southeast corner is 0.080 foot = 0.96 inch above the southwest corner. 
The rod was held on top of water-table at each of the four corners, and the sights were 
nearly equal in length. The south side of the building is about 11.23 inches lower than 
the north side. | 
