DRAINAGE 



291 



Small sizes of tile are sometimes laid by hand, the work- 

 man standing on the tile already laid. In shallow trenches 

 it is difficult to reach down to the grade line, and in a soft 

 bottom there is danger of displacing the tile by the weight 

 of the workman. In trenches where the depth is so great 



After University of Minnesota 



Fig. 238. Laying tile with a tile hook 



that it is difficult to throw the earth out, or where the trench 

 is caving, the workman who finishes the bottom lays each 

 piece of tile as rapidly as the bottom is prepared and throws 

 the last spading of earth back on it. The tile-layer should 

 not stand on the finished bottom while tile are being laid. 

 When large sizes of tile are being laid, where it is necessary 

 to work backward in the trench and lay the tile the finishing 

 work should be done at the same time, each piece being put 

 in place as rapidly as the bed is prepared for it. 



