89 
Ordinary Meeting, February 9th, 1875, 
Edward Schunck, Ph.D., F.R.S., &c., President, in the 
Chaii-. 
Mr. R. F. Gwyther, B.A., Lecturer on Mathematics at the 
Owens College, and Mr. M. M. Pattison Muir, Demonstrator 
in the Chemical Laboratory of the Owens College, were 
elected Ordinary Members of the Society. 
“ A Method of finding the Axes of an Ellipse when two 
conjugate diameters are given,” by J. B. Millar, B.E, 
Communicated by Professor 0, Reynolds. 
In Mechanical Drawing it is frequently required to draw 
an ellipse of which Wo conjugate diameters are given, or, 
what comes to the same thing, to inscribe an ellipse in a 
given parallelogram. 
The following, which so far as I know is new, is a simple 
method of solving this problem by obtaining the axes of the 
ellipse, from which it may be described by means of a tram- 
mel or any other of the well known methods. 
Let AB and CD be two conjugate diameters of an ellipse; 
it is required to determine its axes. 
Proceedings—Lit. & Phil. Soo.— Yol. XIY.— No, 8. —Session 1874-5, 
