Correspondence and papers concerning proposed improvements in clocks and chronometers. The correspondents include F. Baily, F. Beaufort, G. Fisher, A. de Morgan, R. Sheepshanks and W. Tite. The volume includes a paper, originally from 'The Nautical Magazine', titled 'Magnetic Experiments on Chronometers'; a paper, originally from 'The Nautical Magazine', titled 'Glass Balance-Springs to Chronometers'; extracts from 'The County Herald' of October and November 1837 on improvements in chronometers; printed sets of tables of observations made at the Royal Observatory in the years 1832 and 1833 of a clock by E.J. Dent; diagrams relating to a fly wheel pendulum; a paper by Airy titled 'On a new construction of the Going-Fusee' and a review of it in the 'Cambridge Chronicle' of 7 March 1840; extracts from a pamphlet on Paddison's machines for making chronometer parts; an abstract of E.J. Dent's paper on pendulums presented to the British Association for the Advancement of Science; a page extracted from the 'Journal of the Belles Lettres' on E.J. Dent's 'Patent Improvement of Chronometers'; printed specifications from 'Dent's Patent Improvement of Chronometers', with an appendix 'On the Errors of Chronometers and Explanation of a New Construction of the Compensation Balance'; diagrams and calculations of the effect of different positions of the compensation-bar in compensation balances; diagrams by Barraud and Lund showing an invention to counteract the error produced in chronometers by extreme temperatures; copies of E.J. Dent's 'Approximate Table of Longitudes in Time' from the meridian at Greenwich and 'Dent's Table for the Equation of time 1843'; papers relating to the clock for the Royal Exchange; papers from an unknown journal on pendulum escapements; and various diagrams of clock escapements and other improvements in chronometers.