Published online by Cambridge University Press: 03 November 2016
By the elementary plane constructions we mean the bisection of angles and segments of lines and the drawing of perpendiculars. The constructions given below are extremely simple, and it is very possible that some or all of them have been given before; but they seem to be of sufficient interest to be reproduced, for the reason that, if they are not new, they are not generally known.
page 80 note * This construction, and a similar one, were supplied to the writer by two of his pupils, H. J. Higgs and R. H. J. Sasse.