349 



Fig. 143 



saw-cuts at thuir (iriginal k'\x'l as long as it is not destrcned h\ borers. The \-aiiR- of 

 such a record, as much Ironi the engineering and commercial standpoint as from the 

 scientific, is many times more than its cost. 



For purposes for which the above method is deemed too elaborate or costly, 

 useful information can be secured by installing two test pieces at each station. The 

 monthly sections are then taken from one piece and the other is left intact, an examina- 

 tion of the latter being made whenever sections are taken from the former. 



Test stations should be located at the points of most rapid and severe attack. 

 Such points can usually be anticipated as the points of most rajMd current, or in the 

 absence of current, of tidal flow, and in the deeper water. 



Test sections, as removed, should be labeled with the name or other designation 

 of the station, the test piece and saw-cut section numbers, and the dates of installation 

 and removal. Those to be used for the purposes of the San Francisco Bay Marine 

 Piling Survey should be wrapped securely and mailed to Professor C. A. Kofoid, 

 East Hall, University of California, Berkeley, California. 



