chronometer

Definitions

  • WordNet 3.6
    • n chronometer an accurate clock (especially used in navigation)
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Webster's Revised Unabridged Dictionary
  • Interesting fact: The official time ball for the U.S. is on top of the U.S. naval Observatory in Washington, DC As early as 1845, the U.S. Navy dropped a time ball every noon from atop a building on a hill overlooking Washington, DC. People from many miles could set their watches at noon. Ships anchored in the Potomac River could check their chronometers.
    • Chronometer (Mus) A metronome.
    • Chronometer A portable timekeeper, with a heavy compensation balance, and usually beating half seconds; -- intended to keep time with great accuracy for use an astronomical observations, in determining longitude, etc.
    • Chronometer An instrument for measuring time; a timekeeper.
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Century Dictionary and Cyclopedia
    • n chronometer Any instrument that measures time, or divides time into equal portions, or is used for that purpose, as a clock, watch, or dial.
    • n chronometer Specifically, a time-keeper of great accuracy designed to be used for determining the longitude at sea, or for any other purpose where a very exact measurement of time is required. The marine chronometer differs from the ordinary watch in the principle of its escapement, which is so constructed that the balance is free from the wheels during the greater part of its vibration, and also in being fitted with a compensation adjustment, calculated to prevent the expansion and contraction of the metal by the action of heat and cold from affecting its movements. The balance-spring of the chronometer is helicoidal, that of the watch spiral. The pocket-chronometer does not differ in appearance from a watch, except that it is somewhat larger.
    • n chronometer An instrument intended to set the pace and rhythm for a piece of music; a metronome.
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Chambers's Twentieth Century Dictionary
    • n Chronometer kron-om′e-tėr an instrument for measuring time: a watch
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Etymology

Webster's Revised Unabridged Dictionary
Gr. time + -meter,: cf. F. chronomètre,
Chambers's Twentieth Century Dictionary
Gr. chronos, and metron, a measure.

Usage

In literature:

Superior Lever, with Chronometer Balance, Gold, 27, 23, and 19 guineas.
"Notes and Queries, Number 211, November 12, 1853" by Various
Superior Lever, with Chronometer Balance, Gold, 27, 23, and 19 guineas.
"Notes and Queries, Number 212, November 19, 1853" by Various
Superior Lever, with Chronometer Balance, Gold, 27, 23, and 19 guineas.
"Notes and Queries, Number 213, November 26, 1853" by Various
Superior lever, with Chronometer Balance, Gold, 27, 23 and 19 guineas.
"Notes and Queries, Number 214, December 3, 1853" by Various
The watches and chronometer were looked upon with suspicion, their ticking causing curiosity and even anxiety.
"An Explorer's Adventures in Tibet" by A. Henry Savage Landor
Comparing this with the indications of the chronometer, he finds the required correction.
"The Story of the Heavens" by Robert Stawell Ball
Superior Lever, with Chronometer Balance, Gold, 27, 23, and 19 guineas.
"Notes and Queries, No. 209, October 29 1853" by Various
Superior Lever, with Chronometer Balance, Gold, 27, 23, and 19 guineas.
"Notes and Queries, Number 219, January 7, 1854" by Various
On looking at the chronometer I found the time was nearly eleven o'clock.
"To Mars via The Moon" by Mark Wicks
Keep in each chronometer case or in a book nearby the error and daily rate of all chronometers on board.
"Lectures in Navigation" by Ernest Gallaudet Draper
He's got a real dandy sextant in his cabin that I'll take it upon me to let you have the use of; and the chronometer's in there too.
"Dick Leslie's Luck" by Harry Collingwood
Superior Lever, with Chronometer Balance, Gold, 27, 23, and 19 guineas.
"Notes and Queries, Number 231, April 1, 1854" by Various
Superior Lever, with Chronometer Balance, Gold, 27, 23, and 19 guineas.
"Notes and Queries, Number 236, May 6, 1854" by Various
But it may be of very little importance to him to know how chronometers are made.
"The Testimony of the Rocks" by Hugh Miller
Superior Lever, with Chronometer Balance, Gold, 27, 23, and 19 guineas.
"Notes and Queries, Number 223, February 4, 1854" by Various
Superior Lever, with Chronometer Balance, Gold, 27, 23, and 19 guineas.
"Notes and Queries, Number 192, July 2, 1853" by Various
Superior Lever, with Chronometer Balance, Gold, 27, 23, and 19 guineas.
"Notes and Queries, Number 218, December 31, 1853" by Various
Superior Lever, with Chronometer Balance, Gold, 27, 23, and 19 guineas.
"Notes and Queries, Number 217, December 24, 1853" by Various
We had, moreover, four ship's chronometers and several pocket-chronometers.
"Farthest North" by Fridtjof Nansen
I look at my chronometer; 12.50 hours exactly.
"The Lost Kafoozalum" by Pauline Ashwell
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In news:

The Tissot Le Locle Chronometer Edition: The World's Most Interesting Watch.
Kings County Chronometer (8 a.m.
Ramesh Bandhari, a worker with the Indian Institute of Himalayan Geology, uses a chronometer to clock water flow.
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In science:

Unstable ions with long lifetime like 10Be, and 26Al are of particular interest since they provide a measurement of the time of confinement of charged particles in the galaxy (galactic chronometers).
The RICH counter of the AMS experiment
Usually in the practical applications of the standard methods of nuclear chronometry for the stellar and terrestrial processes the decays of nuclei-chronometers from only ground states are taken into account.
To the modification of methods of nuclear chronometry in astrophysics and geophysics
Here we shall deal with the α-radioactive nuclei-chronometers.
To the modification of methods of nuclear chronometry in astrophysics and geophysics
Deeply inside the earth one has to consider the consequences of the formation and decay of the excited nuclei-chronometers during the preceding stellar (and super-nova) nucleosynthesis and during subsequent planet cooling in the melted magma (inside the earth).
To the modification of methods of nuclear chronometry in astrophysics and geophysics
For both cases it is also necessary to take into account the unknown now initial nonzero quantity of the daughter nuclei in the earth (in the examined earth pieces) from the previous stellar (nucleosynthesis and chronometer-decay-chain) processes.
To the modification of methods of nuclear chronometry in astrophysics and geophysics
Recent modifications and additions to this scenario are mentioned here (Fig. 14). Bulk high precision Al/Mg dating of a large number of CAIs suggest that 26Al was homogeneously distributed in the early solar system and confirm the validity of Mg isotopes as a chronometer (Thrane et al. 2006, Connelly et al. 2008).
Meteorites and the physico-chemical conditions in the early solar nebula
When accurate chronometers became available in the latter part of the eighteenth century3 the practice evolved for a ship's chronometer to be checked or rated.
The Behaviour of Clocks and Rods in Special and General Relativity
On return to port the chronometer would be taken to a rating authority.
The Behaviour of Clocks and Rods in Special and General Relativity
They are macroscopic analogs of the radioactive elements (which, although they are mass-wise insignificant play a central scientific role as our best cosmic chronometers).
Icy Bodies in the New Solar System
One assumes in this process the oldest galaxies formed at the same time (standard cosmic chronometers), which is a natural assumption in an FRW universe (one may call it the galaxyformation version of the cosmic Copernican Principle).
Testing the Copernican Principle with Hubble Parameter
We will consider the evolution of D using the nuclear chronometer constraint; that is, we will only consider models which are capable of producing the correct ratios of 232T h, 235U to 238U at the same time.
The Deuterium Abundance and Nucleocosmochronology
Our goal therefore is to explore chemical evolution models which can account for the deuterium abundances observed at the pre-solar epoch and today from a primordial value of ∼ 7.5 × 10−5 constrained by nuclear chronometers.
The Deuterium Abundance and Nucleocosmochronology
The age is constrained in our model by the nuclear chronometers.
The Deuterium Abundance and Nucleocosmochronology
Instead our solutions minimize the error in the chronometer abundance ratios.
The Deuterium Abundance and Nucleocosmochronology
D/H and satisfy the gas fraction, disk enrichment and nuclear chronometers constraints.
The Deuterium Abundance and Nucleocosmochronology
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