Paper, 'A dioptrick problem, why four convex glasses in a telescope shew objects erect' by Will Molineux [William Molyneux] Molyneux explains the dioptric issue of convex glasses in telescopes showing objects upright when there is a single lens, inverted with two lenses, upright with three, and still upright with four lenses. Subject: Optics Published in Philosophical Transactions as 'A dioptrick problem, why four convex-glasses in a telescope, shew objects erect'. The paper is also found in the 'Journal des Scavans' for Monday 17 September 1685, p 466. Read to the Royal Society on 3 November 1686. 3 November 1686