Tachymeter (watch)

tachymeter
A tachymeter (pronounced ) scale is a scale sometimes inscribed around the rim of an analog watch with a chronograph.wikipedia
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Chronograph

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

Analog watch

Analoganalogue watch
A tachymeter (pronounced ) scale is a scale sometimes inscribed around the rim of an analog watch with a chronograph.

Mile

mimilesstatute mile
The function performed by a tachymeter is independent of the unit of distance (e.g. statute miles, nautical miles, kilometres, metres etc.) as long as the same unit of length is used for all calculations.

Nautical mile

nautical milesnmnmi.
The function performed by a tachymeter is independent of the unit of distance (e.g. statute miles, nautical miles, kilometres, metres etc.) as long as the same unit of length is used for all calculations.

Calculation

calculationscalculatingcalculate
As a sample calculation, if it takes 35 seconds to travel one mile, then the average speed is 103 miles/hour.

Average

Rushing averageReceiving averagemean
Note that the tachymeter scale only calculates the average speed.

Telemeter

EDMlaser telemeter
* Telemeter, a similar scale measuring distance using the speed of sound

Measuring instrument

instrumentscientific instrumentinstruments
Tachymeter

Carl F. Bucherer

Bucherer
The watch models of Carl F. Bucherer can be distinguished by certain functions including the chronograph, flyback, tachymeter, tourbillon as well as indicators and displays such as big date and day, power reserve, 24 hours, moon phases, three time zones, calendar, and perpetual calendar.

Omega Speedmaster

Omega Speedmaster Professional
The "Speedmaster" name was coined from the model's novel tachymeter scale bezel (in brushed stainless steel) and by the convention set by prior Omega brands Seamaster and Railmaster.

Rolex Daytona

Paul Newman" Rolex Daytona
In addition to the chronograph features, the wristwatch featured a bezel engraved with a tachymeter, as the watch was intended for racing drivers.

Diving watch

dive watchdiver's watchdiving watches
(See Tachymeter.) Upon entering the water, the diver aligns the zero on the bezel with the minute (or sometimes second) hand, allowing the elapsed time to be read from the bezel.

TX Watch Company

a line of high-end watches
Circumferential tachymeter

Watch

wristwatchwatchesdigital watch
Tachymeter (watch)

Tachymeter

Tachymeter (watch), a scale sometimes inscribed around the rim of an analogue watch