trisector

_ The mathematician knows that such a thing cannot be; but the trisector virtually says it can be, and is bound to produce it, to save time.

A Budget of Paradoxes, Volume II (of II) Augustus De Morgan 1838

_The trisector of an angle, if he demand attention from any mathematician, is bound to produce, from his construction, an expression for the sine or cosine of the third part of any angle, in terms of the sine or cosine of the angle itself, obtained by help of no higher than the square root.

A Budget of Paradoxes, Volume II (of II) Augustus De Morgan 1838

Early in the century there was a Turkish trisector of the angle, Hussein

A Budget of Paradoxes, Volume II (of II) Augustus De Morgan 1838

I will not, from henceforward, talk to any squarer of the circle, trisector of the angle, duplicator of the cube, constructor of perpetual motion, subverter of gravitation, stagnator of the earth, builder of the universe, etc.

A Budget of Paradoxes, Volume I (of II) Augustus De Morgan 1838

Through a compounding of Peaucellier mechanisms, he had already devised square-root and cube-root extractors, an angle trisector, and a quadratic-binomial root extractor, and he could see no limits to the computing abilities of linkages as yet undiscovered. [

Kinematics of Mechanisms from the Time of Watt Eugene S. Ferguson 1960