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15 seconds 24 hours abutments adjusting screws advantages Airy arcs of vibration Astronomer Royal attached auxiliary pieces auxiliary power balance-rim balance-spring Board of Admiralty box chronometer brass and steel centre centripetal action changes of temperature chro chrono chronometer-makers circle compensation arm construction cylindrical piece daily rate describe diagram diameter bar diameter-bar Earnshaw Eiffe elastic error in extremes Excess experiments extreme temperatures extremes of temperature Fahrenheit figure free ends heat and cold IMPROVEMENTS IN CHRONOMETERS isochronal spring lamina Letters Patent little machine little screw long vibrations Lords Commissioners mean temperature mechanical middle projecting portions modification object obtain old chronometers pendulum-spring placed pocket chronometer proper public trial represented reward Robert Molyneux Royal Observatory Royal Society seconds in 24 seen short vibrations shows substance supplementary compensating pieces temperature of 55 thermometer time-screws tried view of fig W. J. Frodsham
Page 25 - Sheriff have hereunto set my Hand and Seal this Seventh day of September, in the fifth year of the Reign of our Sovereign Lord George the Third.
Page 21 - ... it will be deprived of a great part of its polarity. It presents to the eye a spherical action, and forms one grand universal compensating power, in connexion with the arcs of the circle. It scarcely requires any definition ; the object is at once seen to the now fully informed reader and examiner.