Paper, 'Propositions containing some properties of tangents to circles; and of trapeziums inscribed in circles and non-inscribed, together with propositions on the elliptic representations of circles, upon a plane surface, by perspective' by Richard Hey 70 manuscript pages and two plates showing geometric figures for Hey's introductory and perspective propositions. Subject: Geometry Published in Philosophical Transactions as 'Propositions containing some properties of tangents to circles; and of trapeziums inscribed in circles, and non-inscribed. Together with propositions on the elliptic representations of circles, upon a plane surface, by perspective'. Written by Hey in Hertingfordbury near Hertford. Communicated by Edward Balme. Read 31 March 1814. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 1, 1832. March 1814