Account of Improvements in Chronometers

15 seconds adjusting screws advantage affixed Airy Astronomer Royal attached auxiliary pieces auxiliary power balance balance-rim balance-spring barvard College Library Board of Admiralty box chronometer brass and steel cents a day changes of temperature character chro chrono chronometer-makers circle claims for reward construction cylindrical piece day is incurred diameter bar diameter-bar Earnshaw Eiffe Eiffe's account Eiffe's invention elastic experiments extreme temperatures extremes of temperature Fahrenheit February 27 figure five cents free ends Greenwich thre HARVARDIANA heat and cold IMPROVEMENTS IN CHRONOMETERS incurred by retaining isochronal spring January 18 June 29 lamina Letters Patent little screw Lords Commissioners losing mean temperature modification Molyneux's patent obtain old chronometers pendulum-spring pocket chronometer public reward public trial represented return promptly ROBERT MOLYNEUX Royal Observatory Royal Society seconds in 24 seen short vibrations shows strict confidence substance supplementary compensating pieces temperature of 55 thermometer tried view of fig weights