Online Stopwatch

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Online Stopwatch
The British government in 1714 had exposed a high price for the development of a
method applicable to the lake for the accurate determination of longitude. Harrison's
solution, an accurate clock, angry contemporary astronomers and scientists instead of
other solutions astronomical (lunar distance) were looking for the problem. Although
Harrison was ultimately successful, but his model was too expensive. One of the
developments of the fourth and final model Harrison created 1778 watchmaker John
Arnold (1736-1799), who in 1780 coined the term stopwatch in order to apply his
instrument.

Marine stopwatchs were widespread
until the end of World War II and were
then further used in the navies. The
decline of the mechanical stopwatch
came through the quartz crisis in the
second half of the 20th Century, whose
accuracy was better just around three
orders of magnitude by the invention of
the quartz watch. For the classic
stopwatch as a navigational instruments
no longer a need was present. Nowadays,
ships use to navigate GPS (Global
Positioning System), a system that also
uses the exact a knowledge as possible of
the time, but are means for determining
the position of astronomical methods
(tables and devices) remains compulsory.
The default time is now determined using
an atomic clock.

* Even today stopwatchs are made for collectors and enthusiasts.
Colloquially, the term stopwatch is often commonly used for high
quality and precise timepieces. Officially, however, only a device
called stopwatchs, when tested by an observatory or a transition
official control body within a standardized measurement method.
* As the official stopwatch, a clock may only call when their Swiss
movement has passed an examination (by NIH 95-11 / ISO 3159)
of the independent observatory Controle officiel suisse Swiss
stopwatch (COSC). The plant receives a clock the COSC
certification, the manufacturer usually provides the clock with the
words stopwatch.

* Several observatories
offered stopwatch tests.
The Paris Observatory
(1671-1891) began with
tests, followed by
Greenwich (1675-1886),
Liverpool (1843, with
certification standards
from 1893), Hamburg
(1877), Yale (1879),
Kew-Teddington (1883),
Leipzig (1883) and
Besancon (1885).
* stopwatch certification
in Switzerland
* An officially full screen
online stopwatch

Online Stopwatch Timer
Since September 2006, exists in the
observatory works Wempe stopwatch
Glashutte i / SA, a German laboratory for
stopwatch, which is operated by the
jewelry and watch dealers Wempe KG. She
was certified in cooperation with the State
Agency for Metrology and Verification
beings Thuringia and the Saxon State
Agency for Metrology and Verification
nature of the Physikalisch-Technische
Bundesanstalt (PTB) as a calibration
laboratory and field office for online
stopwatch testing of the German
Calibration Service (DKD). Comply with the
limits for mechanical watches (DIN 8319-1)
above the Swiss values. Differences for
Swiss quartz movements there are audit, in
which the following criteria.