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Astronomical clocks -- United States.

 Subject
Subject Source: Library of Congress Subject Headings

Found in 4 Collections and/or Records:

Sidereal and Mean Time Clocks, 1856-01-01/1857-02-27 Digital

FOUND IN: Wolbach Archives, Wolbach Library, Harvard University / Collection: Harvard College Observatory observations, logs, instrument readings, and calculations / Series: Early Work of the HCO under the Bond Adminstrations / File: G1-8, also Ga, Gb: Relating to Clocks and Chronometers
Item — Box 4Identifier: KG11365-6, phaedra0147
Scope and Contents:

Timings of chronometers and Mean Time clocks; notes on clock adjustments; Note of offer by Mr. Dodge to sell telegraph lines to the observatory

Sidereal and Mean Time Clocks, 1856-07-02/1857-02-27 Digital

FOUND IN: Wolbach Archives, Wolbach Library, Harvard University / Collection: Harvard College Observatory observations, logs, instrument readings, and calculations / Series: Early Work of the HCO under the Bond Adminstrations / File: G1-8, also Ga, Gb: Relating to Clocks and Chronometers
Item — Box 4Identifier: KG11365-6, phaedra0148
Scope and Contents:

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.

Sidereal and Mean Time Clocks, 1858-07-02/1860-07-16 Digital

FOUND IN: Wolbach Archives, Wolbach Library, Harvard University / Collection: Harvard College Observatory observations, logs, instrument readings, and calculations / Series: Early Work of the HCO under the Bond Adminstrations / File: G1-8, also Ga, Gb: Relating to Clocks and Chronometers
Item — Box 4Identifier: KG11365-6, phaedra0149
Scope and Contents:

Data relating to timing output of various clocks and chronometers.

Sidereal and Mean Time Clocks, 1860-07-16/1862-09-03 Digital

FOUND IN: Wolbach Archives, Wolbach Library, Harvard University / Collection: Harvard College Observatory observations, logs, instrument readings, and calculations / Series: Early Work of the HCO under the Bond Adminstrations / File: G1-8, also Ga, Gb: Relating to Clocks and Chronometers
Item — Box 4Identifier: KG11365-6, phaedra0150
Scope and Contents:

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

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