RUDDER TRIALS, U. S. S. STERETT. 325 



rise of the keel, just forward of the rudder, the half-breadth was again 

 measured and center-punched at two points, and a straight-edge through 

 these two points carried down to the top of the keel-blocks. This gave a 

 second point on the center-line, which was then snapped in over the tops 

 of the keel-blocks with a chalk line. As a check the half -breadth of keel 

 was measured and projected down to the keel-blocks at still another point. 

 The after edge of the rudder was then set by straight-edge on the true 

 center-line, and the stationary part of the helm indicator set and bolted in 

 position with its 0° point directly under the pointer on the rudder head. 



