Astronomical clocks -- United States.
Found in 29 Collections and/or Records:
Clock Corrections, 1869/1872 Digital
Clock Corrections, 1872/1875 Digital
Clock Corrections, 1875 Digital
Clock Errors, 1878 Digital
Error of Sidereal Clock, 1908 Digital
Error of Sidereal Clock, 1913 Digital
Error of Sidereal Clock, 1911 Digital
Timings of chronometers and Mean Time clocks; notes on clock adjustments; Note of offer by Mr. Dodge to sell telegraph lines to the observatory
Questions propounded by Mr Briggs, relative to his clock with a circulating pendulum; Comparison of sidereal clock with that containing Briggs patent circulating pendulum; recorded chronometer timings; Lieut. Ives set up his transit instrument on the stand of our variation-transit and obtained the following y E.C. and the Spring-governor.; Result, time to be given 4 1/2 seconds sooner at Cambridge than the bells at Boston should strike.
Data relating to timing output of various clocks and chronometers.
1860 July 17/18: "These chronometers were used for observing the solar eclipse. See Transit Book of this date."; "Corrections of the New Clock. (Isody. Escap.) [i.e., Isodynamic Escapement] Oct. 23 1860 to Apr. 8 1861; Timing data recorded for various devices; Cambridge and Boston
Directions for Absolute Time; Brief Ephemeris for locally-viewed stars for May 1865; Eclipse of Sun - End West Wing Equatorial; Timing output data and status information relating to a number of chronometric devices