Chronograph

chronographschronographic wristwatchtimer
A chronograph is a specific type of watch that is used as a stopwatch combined with a display watch.wikipedia
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Watch

wristwatchwatchesdigital watch
A chronograph is a specific type of watch that is used as a stopwatch combined with a display watch.
Most electronic quartz watches, on the other hand, include time-related features such as timers, chronographs and alarm functions.

Complication (horology)

complicationscomplicationcomplicated
More complex chronographs use additional complications and can have multiple independent hands to measure seconds, minutes, hours and even tenths of a second.
Common complications in commercial watches are day/date displays, alarms, chronographs (stopwatches), and automatic winding mechanisms.

Louis Moinet

Louis Moinet invented the chronograph in 1816 for use in tracking astronomical objects.
Louis Moinet (1768–1853), inventor of the chronograph, was born into a prosperous family of farmers in Bourges, France, was a French horologist, sculptor and painter.

Tachymeter (watch)

tachymeter
In addition, many modern chronographs use moveable bezels as tachymeters for rapid calculations of speed or distance.
A tachymeter (pronounced ) scale is a scale sometimes inscribed around the rim of an analog watch with a chronograph.

Stopwatch

stopwatchesstop watchhand-timed
A chronograph is a specific type of watch that is used as a stopwatch combined with a display watch.
Chronograph

Flyback chronograph

flyback
As different uses for the chronograph were discovered, the industry responded with different models introducing such features as the flyback (where the second hand could be rapidly reset to zero), minute and hour timers, Rattrapante (or multiple second hands one of which can be stopped and started independently) and waterproof models for divers and swimmers.
A flyback chronograph is a complication watch, in which you can use the reset function without the need to first stop the chronograph.

Omega Speedmaster

Omega Speedmaster Professional
Another famous usage of the chronograph was during all of NASA's Apollo missions to the moon, each astronaut was equipped with a fully functioning chronograph, the Omega Speedmaster.
Omega Speedmaster is a line of chronograph wristwatches produced by Omega SA.

Double chronograph

Rattrapantesplit chronoSplit second hand
As different uses for the chronograph were discovered, the industry responded with different models introducing such features as the flyback (where the second hand could be rapidly reset to zero), minute and hour timers, Rattrapante (or multiple second hands one of which can be stopped and started independently) and waterproof models for divers and swimmers.
A watch with a double chronograph has two seconds hands.

Nicolas Mathieu Rieussec

It was Nicolas Mathieu Rieussec who developed the first marketed chronograph at the behest of King Louis XVIII in 1821.
The term was particularly well chosen: chronograph comes from the Greek words chronos and graphin, which means “that which writes time”.

Chronometer watch

chronometerchronometerscertified
The term chronograph is often confused with the term chronometer.
Such an instrument is in fact a chronograph or chronoscope.

Telemeter

EDMlaser telemeter
Other bezels feature Telemeter scale, for distance.
The telemeter chronograph is a feature of a wristwatch, which allows the user to approximately measure the distance to an event that can be both seen and heard (e.g. a lightning bolt or a torpedo strike) using the speed of sound.

Louis XVIII of France

Louis XVIIIKing Louis XVIIIComte de Provence
It was Nicolas Mathieu Rieussec who developed the first marketed chronograph at the behest of King Louis XVIII in 1821.

Automatic watch

automaticself-windingself-winding watch
Although self winding watches and clockwork have been around since the late 1700s, the automatic (self winding) chronograph was not invented until the late 1960s.

COSC

ChronometerChronometer Certificatechronometer certification
Where "Chronograph" refers to the function of a watch, chronometer is a measure of how well a given mechanical timepiece performs: in order to be labeled a chronometer the timepiece must be certified by the COSC, the official Swiss Chronometer testing institute, after undergoing a series of rigorous tests for robustness, accuracy and precision under adverse conditions (though these requirements fall far short of the accuracy achieved by even the cheapest modern quartz watch).

Artillery

heavy artilleryordnanceartillery piece
Originally the term chronograph was mainly used in connection with artillery and the velocity of missiles.

Apollo

Apollo CarneiusPhoebusApollo Pythius
Another famous usage of the chronograph was during all of NASA's Apollo missions to the moon, each astronaut was equipped with a fully functioning chronograph, the Omega Speedmaster.

Kinetic energy

kinetickinetic energiesorbital velocity
Automatic, non-digital chronographs do not require a battery, because the arm or wrist of the wearer creates kinetic energy, which results in the total energy source needed for this device to work.

Rotor

Throughout the day, while the wearer of the watch is walking, the swinging motion of his arm forces a semicircular rotor to turn on a pivot within the watch.

Ratchet (device)

ratchetratchetingpawl
The rotor is attached to a ratchet that winds the mainspring in the watch, so that it is ready for use at all times.

Surface-supplied diving

surface supplied divingsurface supplieddiver's umbilical
Specialized chronographs are used by deep sea and scuba divers.

Scuba diving

scubascuba diverscuba divers
Specialized chronographs are used by deep sea and scuba divers.

Tourbillon

tourbillion
A tourbillon, although not strictly limited to chronographs, is an escapement set in a cage and placed in a rotating balance in order to minimize the effects of gravity on the escapement and increase precision.

Escapement

detent escapementCross-beat escapementduplex escapements
A tourbillon, although not strictly limited to chronographs, is an escapement set in a cage and placed in a rotating balance in order to minimize the effects of gravity on the escapement and increase precision.

Marine chronometer

chronometerchronometersmarine chronometers
* Marine chronometer

Rolex Daytona

Paul Newman" Rolex Daytona
The Rolex Cosmograph Daytona is a mechanical chronograph wristwatch.