Account of Improvements in Chronometers

action adjustment Admiralty advantage affixed Airy application arcs Astronomer Royal attached attention auxiliary power balance balance-rim bearing brass called changes of temperature character chronometer-makers chronometers circle circumstances claims commonly compared compensation consideration construction correct describe difficulty Eiffe Eiffe's error excellence Excess experiments extremes of temperature figure five give heat and cold important improvements IMPROVEMENTS IN CHRONOMETERS intended introduced invention isochronal known Lords Commissioners losing machine manner mean mean temperature mechanical modification Molyneux necessary object obtain patent perform pieces placed pocket chronometer portions position prepared present principle public trial reference Report represented reward ROBERT MOLYNEUX Royal Observatory Royal Society screws seconds seen short shown shows similar specification spring steel substance supplementary compensating temperature trial tried usual vibrations weights