96 REPORT OF THE CALIFORNIA EARTHQUAKE COMMISSION. 
yards, due doubtless to the establishment of a partial vacuum within the pipe by the 
sudden withdrawal of the water from the arch in the pipe at the time of the shock, owing 
either to the leakage below, or the propulsion of the water induced by the shock. (See 
plate 60s.) 

So Seale along fence line 
Bee o 500 1ooofeet 
a 
ae cae Scale normal to fence line t 
=m ° 10 20 feet 
Fig. 31.— Fence C of fig. 30. 
Scale in feet 
Displacement 9' 
Present 
Easton 

Fia. 32.— Dislocation of fence near San Andreas Lake. After H. Schussler. 
At a point about a mile from the upper end of San Andreas Lake, the fault intersects 
a bend in the pipe at two places, and here again the pipe was telescoped. (See plate 
60a.) The conditions at one of these intersections are thus described by Mr. Robert 
Anderson : 
The pipe makes an angle of about 15° with the fault-trace, the end of the pipe on the 
north side of the fault running that much nearer the north. The ends of the pipe on 
opposite sides of the fracture were therefore thrust into each other. The furrow was at this 
place divided into several smaller ones, the disturbed zone covering an area of considerable 
width. The pipe was broken in three places within 100 feet. In one place it was tele- 
scoped 58 inches, as shown in plate 59B; in another 17 inches, and in a third, the one 
farthest north, 41 inches. 
Near the head of the lake, the pipe was again intersected by the fault, with results 
described by Mr. Anderson as follows: 
The pipe line runs almost parallel with the fracture, but slightly more to the west at 
this point, so that the acute angles made by the ends of the pipe with the furrow were in 
this case on opposite sides of the furrow to those in the two previous instances. In other 
words, the southeast end of the pipe was farther to the east than the southeast end of the 
