Quadrature of the circle Demonstration of a ‘solution’ to the impossible problem of the quadrature (or squaring) of the circle: consisting of a circular brass plate with an equatorial bar and attached steel angles. Together with a fitted red leather case lined with velvet. The bisected brass ring is inscribed recto: ‘To His Royal Highness Prince Augustus Frederick Duke of Sussex President of the Royal Society of London are Most Respectfully Dedicated by the original Discoverer. Charles Hudson of Calcutta; the Solution and Demonstration of The Quadrature of the Circle and Geometric Mean Anno Christi 1831’. Inscribed verso: ‘See Letters to the Royal Society of London dated 20th January 1825- 2 April 1825 9th June 1826, 20th June 1828, 12 November 1830 by Charles Hudson. See Preface to the Society Philosophical Transactions Part 1 of the Years 1827 and 1828.’ 1831