si I:M.U:IM: TCNNKLIN.; 241 



The cylinder, AS it was completed, penetrated 9 ft. into the 

 hard clay, and was underpinned with brickwork for a depth of 

 29 ft. or more, to a jMiint 4 ft. below the grade line of the 

 tunnel. At the lower end, the section of the shaft was changed 

 from a circle to a square. Later the steel cylinder was lined 

 with brick. 



On March 28, 1894, an agreement was made with Mr. 

 Tims. .Murphy to construct the tunnel from the lake shaft 

 toward the shore. Except that considerable water was en- 

 countered, which, owing to inadequate pumping machinery, 

 filled the tumid and shaft at two different times, and had to 

 be removed, no very great difficulty was had with this part of 

 the work. 



On July 28, 1895. the headings from the lake and shore 

 shafts met Meanwhile the cast-iron pipe intake, the intake 

 crib, etc., had been completed, and practically all that remained 

 to be done was to clean the tunnel and lift the pumping 

 machinery at the shore shaft. During the cleaning, the air 

 pressure had been kept up on account of the leakage through 

 the brick lining, and, indeed, the pressure was kept up until 

 the last possible moment, and everything made ready for 

 removing the air locks, bulkheads, pumps, etc., in the least 

 possible time. The pumps \\cn- the last to come out. 



