TESTING STONEWARE PIPES USED IN RETICULATION SEWERS. LXIII. 



to a circular pipe 2 feet in diameter, wire netting is inserted in 

 the body of the material, and wire is spirally wound round in 

 the body of the material, also a horizontal base 7 inches wide is 

 provided: — 



Number of 

 Pipes. 



Thickness in 

 inches. 



Age in clays. 



Pressure at first fracture 

 under 3fi-iuch block. 



Pressure at final fracture 

 under 36-iuch block. 



16 



2 



100 



6,384 fts. 



10,675 lbs. 



The following table shows that even after the final fracture these 

 pipes spring back half-way to the original shape when the pressure 

 is removed : — 



Number of 

 Pipes. 



Original s r ze. 



Size under greatest pressure. 



Size after pressure removed. 



10 



2 ft. 4ff in. x 

 1 ft. 9 J in. 



2 ft. 4- 3 %r in. x 

 1 ft. lO-A- in. 



2 ft. 4-/V in. x 

 1 ft. 91 in. 



In conclusion the author wishes to thank the following engineers 

 for their courtesy in supplying information relating to pipe testing 

 done under their supervision : — Mr. J. Davis, m. Inst. C.E., formerly 

 Engineer-in-Chief, Sewerage Construction Public Works Depart- 

 ment, and now Under Secretary for Public Works, N. S. Wales ; 

 Mr. W. Thwaites, m. Inst. C.E., Engineer-in-Chief, Metropolitan 

 Board of Works, Melbourne ; Mr. A. B. Moncrieff, m. Inst. C.E., 

 Engineer-in-Chief, Public Works, South Australia ; Mr. R. L. 

 Mestayer, m. Inst. C.E., Drainage Engineer, Wellington, N. Zealand. 



The author also wishes to thank our chairman, Mr. J. M. Smail, 

 M. Inst. C.E., for granting him access to all the records of the Water 

 and Sewerage Department on this subject. 



