How to use a chronometer?
The observer measures by a clock or chronometer the time elapsing between the receipt of the flash, which passes practically instantaneously, and the receipt of the report.
The above method of determining the geographical meridian has the serious objection that it is necessary to know the error of the chronometer with very considerable accuracy, a matter of some difficulty when observing at any distance from a fixed observatory.
The time of vibration is obtained by means of a chronometer, using the eye-and-ear method.
The time of transit of the sun or star across the vertical wire of the telescope having been observed by means of a chronometer of which the error is known, it is possible to calculate the azimuth of the sun or star, if the latitude and longitude, of the place of observation are given.
His pure tight skin was an excellent fit; and closely wrapped up in it, and embalmed with inner health and strength, like a revivified Egyptian, this Starbuck seemed prepared to endure for long ages to come, and to endure always, as now; for be it Polar snow or torrid sun, like a patent chronometer, his interior vitality was warranted to do well in all climates.
The heat-flow through the central column amounted to about 7.5 calories in 54 seconds, and was measured by continuing the tube through the iron plate into the bulb of a Bunsen ice calorimeter, and observing with a chronometer to a fifth of a second the time taken by the mercury to contract through a given number of divisions.
In describing experiments on the velocity of sound he states that " on one day and one day only, February 9, 1822, the officer's word of command ` fire ' was several times heard distinctly both by Captain Parry and myself about one beat of the chronometer [nearly half a second] after the report of the gun."