Specification and description, for the trisection of any rectilineal angle
By: by Thomas Thorpe
Contributors: Bell & Woodburn
Publisher: T. Thorpe
Published: 1863
Place of publication: Ottawa
Language: eng
Subjects: Trisection of angle; Geometry; Famous problems; Trisection de l'angle; Géométrie; Problèmes classiques
Notes: Title from p. [4].

Caption title: Construction : let ABC be any rectilineal angle to be trisected.

"Patented, 1st July, 1863"