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Tachymeter scale on a Citizen watch bezel. A tachymeter (pronounced / t æ ˈ k ɪ m ə t ər /) is a scale sometimes inscribed around the rim of an analog watch with a chronograph.It can be used to conveniently compute the frequency in inverse-hours of an event of a known second-defined period, such as speed (distance over hours) based on travel time (distance over speed), or measure distance ...
A chronograph is a specific type of watch that is used as a stopwatch combined with a display watch. A basic chronograph has hour and minute hands on the main dial to tell the time, a small seconds hand to tell that the watch is running, and a seconds hand on the main dial usually equipped with a sweeping movement for precision accompanied by a ...
Tachymeter may refer to: Tachymeter (survey) or tacheometer, a type of theodolite used for rapid measurements of distance Tachymeter (watch) , a scale sometimes inscribed around the rim of an analogue watch
The first tachometer was described by Bryan Donkin in a paper to the Royal Society of Arts in 1810 for which he was awarded the Gold medal of the society. This consisted of a bowl of mercury constructed in such a way that centrifugal force caused the level in a central tube to fall when it rotated and brought down the level in a narrower tube above filled with coloured spirit.
Notes/Features 1963–69 6239 722, 722-1: 18,000: Engraved (stainless steel) No Earliest model carries extra tachymeter engraving at 275 units/hr. [11] 1965–69 6240 Black (acrylic inlay) Yes First appearance of optional metallic dial finish. [9] 1965–69 6241 No All variants include "Daytona" printed on dial. [9] 1970 6262 727: 21,600
Literary movements are a way to divide literature into categories of similar philosophical, topical, or aesthetic features, as opposed to divisions by genre or period. Like other categorizations, literary movements provide language for comparing and discussing literary works.
Wild brand subtense bar. Another device used in tacheometry to measure distance between the measuring station and a desired point is the subtense bar. [2] This is a rigid rod, usually of a material insensitive to change in temperature such as invar, of fixed length (typically 2 metres (6.6 ft)).
Audemars Piguet Holding SA (French pronunciation: [odmaʁ piɡɛ]) is a Swiss manufacturer of luxury watches, headquartered in Le Brassus, Switzerland. [2] [3] The company was founded by Jules Louis Audemars and Edward Auguste Piguet in the Vallée de Joux in 1875, acquiring the name Audemars Piguet & Cie in 1881.