ABSTRACT OF PROCEEDINGS. xli. 
ABSTRACT OF PROCEEDINGS, DECEMBER 1, 1897. 
The General Monthly Meeting of the Society was held at the 
Society’s House, No. 5, Elizabeth-street North, on Wednesday 
evening, December Ist, 1897. 
The President, Henry DEANE, M.A., M. Inst. C.E., in the Chair. 
Thirty-four members and two visitors were present. 
The minutes of the preceding meeting were read and confirmed. 
The following gentleman was duly elected an ordinary member 
of the Society :— 
Webb, Frederick William, o.m.G., J.p., Clerk of the Legis- 
lative Assembly, Sydney. 
Messrs. C.R. Waxsu and Davip FEL were appointed Auditors 
for the current year. 
The President announced that a Conversazione would be held 
at the University on the 14th January 1898, and that members 
not in arrears with their subscriptions would receive cards of 
invitation. 
A letter was read from the Mueller National Memorial Com- 
mittee, inviting subscriptions. 
THE FOLLOWING PAPERS AND NOTES WERE READ :— — 
1. “On the steady flow of water in uniform pipes and channels,” 
by G. H. Kyieps, r.r.a.8., Lecturer in Surveying, University 
of Sydney. 
The paper dealt generally with the nature of the two régimes 
under which flow takes place, and of the instability of the recti- 
linear flow in pipes. In the first or linear régime, the velocity 
formula for a pipe of elliptical cross-section is, 
Curt? A BIO (1) 
8 L $(B*+0") ay 
in which g is the acceleration of gravity, p the density of the fluid, 
by means of a column of which the height H—the difference 
of the pressures, at two sections of a horizontal tube, the distance 
