312 Scientific Proceedings, Royal Dublin Society. 
noting the rate at which it ran through. As the result would 
have to be compared with calculation, it was necessary to cut the 
peat into a solid of revolution, so that the flow could be completely 
specified by a single section, and the graphic method could be 
employed. 
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Fic. 7. 
For simplicity and strength I chose the form which can he 
made as follows :—Cut a cube; then pare down four edges until 
you have a cylinder with diameter equal to its length ; then in 
one end of this cut out a cylindrical hole similar in form to the 
