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yuthana's BlogCategory Jewellery
Zulu Time: Yet another reference to GMT and UTC! The use of this phrase is prevalent in civil aviation and military. Why Zulu? Well, Zulu is the phonetic for Z and the Z is for the Zero meridian, being that meridian passing through Greenwich.
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Water Resist/WR: Watches have varying degrees of water resistancy, ranging from WR30 Meters to some specialist watches having a capability of withstanding water to 10000 Meters. The usual for a diver's watch is 200m whilst 100m would be suitable for everyday swimming.
Winder/Winding Crown: Same as Crown, above. Used for winding the watch and setting time/date.
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Tachymeter: A scale used to measure units per hour. Commonly found on the bezels of chronograph watches, an event is timed by using the chronograph seconds hand. The hand is stopped when the event ends and the hand will point to the number of units per hour that could be achieved.
Tourbillon: A complex piece of micro-engineering which results in the escapement of a watch rotating on its own axis; the object of the exercise is to cancel out the variations in running regularity which can be caused by the watch being in different positions; (a watch may gain in one position yet lose in another). Tritium: An isotope of hydrogen used in the luminous compounds which give watch dials and hands their glow in the dark capabilities. Many watch dials will show a small T at the bottom, indicating the use of tritium. The half life of tritium is 12.5 years thus it will lose its ability to provide illumination as time passes. Now largely superceded by non-radioactive organic compounds such as the trade name Luminova.
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