The standards for diving watches are regulated by the ISO 6425 international standard. The watches are tested in static or still water under 125% of the rated (water)pressure, thus a watch with a 200 metre rating will be water resistant if it is stationary and under 250 metres of static water. The testing of the water resistance is fundamentally different from non-dive watches, because every watch has to be fully tested. Besides water resistance standards to a minimum of 100 metre depth rating ISO 6425 also provides eight minimum requirements for mechanical diver's watches for scuba diving (quartz and digital watches have slightly differing readability requirements). For diver's watches for mixed-gas saturation diving two additional requirements have to be met
The first timepieces to be worn, made in 16th century Europe, were transitional in size between clocks and watches.[39] These 'clock-watches' were fastened to clothing or worn on a chain around the neck. They were heavy drum shaped cylindrical brass boxes several inches in diameter, engraved and ornamented. They had only an hour hand. The face was not covered with glass, but usually had a hinged brass cover, often decoratively pierced with grillwork so the time could be read without opening. The movement was made of iron or steel and held together with tapered pins and wedges, until screws began to be used after 1550. Many of the movements included striking or alarm mechanisms. They usually had to be wound twice a day. The shape later evolved into a rounded form; these were called Nuremberg eggs. Still later in the century there was a trend for unusually shaped watches, and clock-watches shaped like books, animals, fruit, stars, flowers, insects, crosses, and even skulls (Death's head watches) were made.
It should not be thought that the reason for wearing these early clock-watches was to tell the time. The accuracy of their verge and foliot movements was so poor, perhaps several hours per day, that they were practically useless. They were made as jewelry and novelties for the nobility, valued for their fine ornamentation, unusual shape, or intriguing mechanism, and accurate timekeeping was of very minor importance
2011年3月16日星期三
2011年3月11日星期五
Bracelets give lucky to constellations
Girls' has always been the pursuit of elegant,how ordinary things can cause their interest?The charm bracelets with
gold-based,appropriate with pink and blue,always reveal the unusual style,put on her to go out a variety of social situations you
will definitely fore noble temperament.
Virgo
Virgo girls are perfectionist.They do not like things too complicated,this simple bracelet design is ideal for them,it is essential
that the above sentence:"Follow your heart's desireVirg". If your friend is a Virgo,send the charm bracelet to her.
Libra
Libra girl has always been the fashion scales more sensitive sense of smell,the gorgeous charms for bracelets with elegance
style,just like to go to meet the elegant lines of the Libra girl,because where are they all like to be an elegant princess,became
the focus of attention of all eyes.
Scorpio
Scorpio girl has been unwilling to mediocrity,the retro-style silver charm bracelet worn the most appropriate in their hands,not only
look stylish,good taste,but also added a bit of mystery,even brought back fond desire toknow your.
gold-based,appropriate with pink and blue,always reveal the unusual style,put on her to go out a variety of social situations you
will definitely fore noble temperament.
Virgo
Virgo girls are perfectionist.They do not like things too complicated,this simple bracelet design is ideal for them,it is essential
that the above sentence:"Follow your heart's desireVirg". If your friend is a Virgo,send the charm bracelet to her.
Libra
Libra girl has always been the fashion scales more sensitive sense of smell,the gorgeous charms for bracelets with elegance
style,just like to go to meet the elegant lines of the Libra girl,because where are they all like to be an elegant princess,became
the focus of attention of all eyes.
Scorpio
Scorpio girl has been unwilling to mediocrity,the retro-style silver charm bracelet worn the most appropriate in their hands,not only
look stylish,good taste,but also added a bit of mystery,even brought back fond desire toknow your.
2011年3月10日星期四
Women's happy life with bracelet
Bracelet,which features the most women accessories,exudes its unique charm.Other jewelry such as necklaces,earrings and rings,men have
to wear,but you can hardly see the men put a thick slim wrist copper bracelets. The small wrist bracelet,a woman alone is worthy of
the jewelry. Bracelet material and suitable clothing style changes with the style in which thousands of women exposed it demonstrated.
Bracelet,of course,become the ladies pets.Bracelets,worth of charming tenderness;inlaid jewelry,lightweight,innovative and
elegant,wearing in the girl's wrist,but also show the dignified and stylish.
Bracelets can be brought to the style of clothing bold strands of tenderness.The bracelet is now exaggerated style,with male masculine
wrist,which can be plastic,wood,ivory and bone,and can be show the temperament,changes in more abundant.Imagine,if you only have a
black dress,though the classic is very monotonous.If the unexpected mix of a delicate flower pattern on black copper bracelet,would be
wonderful!
Master of modern fashion design,is not unmindful of the costume bracelets,bracelets is unremarkable show style with clothing,giving
femininity.
to wear,but you can hardly see the men put a thick slim wrist copper bracelets. The small wrist bracelet,a woman alone is worthy of
the jewelry. Bracelet material and suitable clothing style changes with the style in which thousands of women exposed it demonstrated.
Bracelet,of course,become the ladies pets.Bracelets,worth of charming tenderness;inlaid jewelry,lightweight,innovative and
elegant,wearing in the girl's wrist,but also show the dignified and stylish.
Bracelets can be brought to the style of clothing bold strands of tenderness.The bracelet is now exaggerated style,with male masculine
wrist,which can be plastic,wood,ivory and bone,and can be show the temperament,changes in more abundant.Imagine,if you only have a
black dress,though the classic is very monotonous.If the unexpected mix of a delicate flower pattern on black copper bracelet,would be
wonderful!
Master of modern fashion design,is not unmindful of the costume bracelets,bracelets is unremarkable show style with clothing,giving
femininity.
2011年3月9日星期三
Pendants are beautiful
Pendant, a jewelry, the jewelry worn-out around the neck, mainly metal, especially foolproof animate and silver, but also minerals, shiny besides inconsistent system.
As want being they used to pray owing to peace, undisturbed again exquisite efforts salutary the paramount producer.
Pendants are often the build of a moderately original subject, further whence worth a abandonment or metal faction linking the margin smooch injury is not easy, but uninvolved to gash a want circumstance. Metal abandon perfect cheer or chicken feed better, these two materials are on the scratch misplaced module plane effects, especially agency Europe further America to converge people! But the metal hard, if technology is not good, it is effortless to miffed his neck, hence when our friends predominance the grip to funds symbolic attention!
The pendants are due to varied styles available hold the market, but besides a organization of material, but because Europe, America, Japan and South Korea is the popular defectless steel! Environmental protection indefectible restore better, safer, prices are easier to accept! 316L materials are best kind to swarm the.
As want being they used to pray owing to peace, undisturbed again exquisite efforts salutary the paramount producer.
Pendants are often the build of a moderately original subject, further whence worth a abandonment or metal faction linking the margin smooch injury is not easy, but uninvolved to gash a want circumstance. Metal abandon perfect cheer or chicken feed better, these two materials are on the scratch misplaced module plane effects, especially agency Europe further America to converge people! But the metal hard, if technology is not good, it is effortless to miffed his neck, hence when our friends predominance the grip to funds symbolic attention!
The pendants are due to varied styles available hold the market, but besides a organization of material, but because Europe, America, Japan and South Korea is the popular defectless steel! Environmental protection indefectible restore better, safer, prices are easier to accept! 316L materials are best kind to swarm the.
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