ABSTRACT OF PROCEEDINGS. XXXxiil. 
ABSTRACT OF PROCEEDINGS, NOVEMBER 83, 1897. 
The General Monthly Meeting of the Society was held at the 
Society’s House, No. 5, Elizabeth-street, North, on Wednesday 
evening, November 3rd, 1897. 
The President, Henry Drang, M.A.,M. Inst. C.E., in the Chair. 
Thirty-three members and three visitors were present. 
The minutes of the preceding meeting were read and confirmed. 
The following Weary were duly elected ordinary Members 
of the Society :— 
Ronaldson, James Henry ; Darlinghurst. 
Russell, Harry Ambrose, B.A.; Ashfield. 
The certificate of one candidate was read for the second time. 
THE FOLLOWING PAPERS AND NOTES WERE READ :— 
l. “The effect of temperature on the Tensile and Compressive 
Properties of Copper,” by Prof. WARREN, M. Inst.c.E.,and Mr. 
S. H. Barracioucn, M.M.E. 
_ This investigation was carried out on some fifty copper test 
Pieces supplied by Mr. W. Thow, M. Inst.c.E., Chief Mechanical 
Engineer to the N.S. Wales Government Railways. The test pieces 
were immersed in a very heavy cylinder oil, contained in a cast iron 
bath, which was provided with a loosely fitting stuffing box at 
each end to allow of the necessary connection being made with 
the test piece. The temperature range attained was from 25° F. 
to 535° F., the temperatures being measured by certified mercurial 
thermometers. The extensions and compressions were measured 
by Kennedy’s lever extensometer and Martens’ mirror apparatus. 
The chief conclusions arrived at were :—(a) The relation between 
the ultimate tensile strength and the temperature may be very 
closely represented by the equation f= 32,000 —21 ¢, where “/” is 
the tensile strength expressed in pounds per square inch, and ¢ is 
the temperature expressed in degrees F. (+) Temperature does 
c—Nov. 3, 1897, 
