The Mydeltapi webstore - Quality watches and jewelry artworks. Also scroll down to find information about watches noble metals and noble stones

eMail: aquila_grande@yahoo.no

Back to main menu - boat models, car models, rc robots, electronics, chemistry, binoculars, microscopes, other hobby and professional items.
Click here for: Natural drugs to keep you young. Help for problems with the skin, hair digestion, circulation, joints. Help for men's and women's issues. Potent slimming help and help to build muscles

Drugs and tools for men and women to increase sexual satisfaction and potency - boost for erections, lubrication, engorgement, genital and mental feelings, orgasms

Help for edema, stomach trouble and hemorrhoids, heart issues, mental exhaustion and poor concentration, depressiveness, sluggish thyroid, allergy, flu, candida, rheumatism, UTI and more, please click here

Next page with exhibition of more watches and jewelry

First page with exhibition of more watches and jewelry

Please scroll down to find links to good online shops where you can find even more watches and jewelry pieces
Verseo.com

Watches, jewelry and apparel

Welcome to this online store of quality jewelry, watches, apparel and beauty articles from for a good prize. Pleace click on the banners to learn more or order. Furter down on this page you can find links to good sources of even more jewelry and apparel than those shown at this page and also find some explanation about technical consepts regarding watches.

Jewelry creations of heigh artistic level

Elizabeth Buenaventura - Youth Pink Tourmaline Necklace

Elizabeth Buenaventura - Youth Pink Tourmaline Necklace

14 kt gold and 0.08 ct pink tourmaline birthstone charm. 16" chain. Handmade with love in New York. Ships within 5 to 7 business days.




.50ct Peridot Stud Earrings in 14k Yellow Gold

.50ct Peridot Stud Earrings in 14k Yellow Gold

For all of you August Birthstone babies, here are the perfect round cut solitaire peridot earrings mounted in solid 14 karat yellow gold mountings, with friction earring backs.




1 Carat Round Shape Peridot and Halo Diamond Ring In 14 Karat Yellow Gold

1 Carat Round Shape Peridot and Halo Diamond Ring In 14 Karat Yellow Gold

This stunning gemstone and halo diamond ring features one 6mm round shape peridot gemstone at 0.90 carats. It is surrounded by 18 sparkling diamonds in a halo in H-I color, I1-I2 clarity at 0.09 carats. Total gem weight is 0.99 carats. This ring is crafted in 14 karat yellow gold.




9 Inch 11 3/4 Carat Peridot and Diamond Alternating Tennis Bracelet In 14K Yellow Gold

9 Inch 11 3/4 Carat Peridot and Diamond Alternating Tennis Bracelet In 14K Yellow Gold

This classic gemstone bracelet features shimmering white diamonds in I-J color, I1-I2 clarity and peridot gemstones. The 6 inch bracelet contains 39 gemstones and diamonds at 7.80 carats. The 6.5 inch bracelet contains 43 gemstones and diamonds at 8.60 carats. The 7 inch bracelet contains 46 gemstones and diamonds at 9.20 carats. The 7.5 inch bracelet contains 49 gemstones and diamonds at 9.80 carats. The 8 inch bracelet contains 53 gemstones and diamonds at 10.60 carats. The 8.5 inch bracelet contains 56 gemstones and diamonds at 11.20 carats. The 9 inch bracelet contains 59 gemstones and diamonds at 11.80 carats. This bracelet is approximately 3.8mm wide and is crafted in 14 karat yellow gold. This bracelet has a secure, box with tongue and safety clasp.




Tresor Collection - Green Tourmaline Trillion With Diamond Pave All Round Ring In 18K Yellow Gold

Tresor Collection - Green Tourmaline Trillion With Diamond Pave All Round Ring In 18K Yellow Gold

16.53 cts green tourmaline wt. .16 cts diamond wt. 18k yellow gold




Sterling Silver Opal Teardrop Necklace With Rose Accents, 18 Inches

Sterling Silver Opal Teardrop Necklace With Rose Accents, 18 Inches

This stunning necklace features a huge, teardrop shape created opal gemstone. It has rose flower accents along it. The pendant measures 1 3/4 inches long and 1 inch wide. It hangs on an 18 inch sterling silver cable chain with a spring-ring clasp.




Fine Jewelry Vault UBUBRBK7205W14BT December Birthstone Blue Topaz Graduated Bead Necklace in 14K White Gold 15 CT TGW

Fine Jewelry Vault UBUBRBK7205W14BT December Birthstone Blue Topaz Graduated Bead Necklace in 14K White Gold 15 CT TGW

Cool blue brilliant cut blue topaz rounds are beautifully lined up in this 14K white gold necklace secured with a lobster claw clasp. This 15 ct. tw blue topaz necklace will make her look like one cool chick in the crowd. This gemstone necklace is perfect for December birthday and wedding anniversary gifts.




Majesty Diamonds 3.66 CT Round Cut Blue Topaz Solitaire Pendant Necklace in 14K Yellow Gold With Chain 3.66 Carat

Majesty Diamonds 3.66 CT Round Cut Blue Topaz Solitaire Pendant Necklace in 14K Yellow Gold With Chain 3.66 Carat

Bring clear skies and sunshine to your look when you make this dazzling 3 2/3 CT Round Cut Blue Topaz Solitaire Pendant a part of your everyday attire. Whether you're wearing a dress or jeans this lovely necklace is going to look great no matter what you pair it with. This sensational blue topaz necklace is going to quickly become your favourite go-to piece of jewelry. The round topaz has an exceptional 3.67 CTW a color rating of Blue and a clarity range of triple AAA. The metal weight is 1.5 grams.




41 Carat Pink Tourmaline and Pearl Triple Strand Necklace In 14K Yellow Gold, 20 Inches

41 Carat Pink Tourmaline and Pearl Triple Strand Necklace In 14K Yellow Gold, 20 Inches

This gorgeous necklace features 3 freshwater pearls, each about 8mm each, and tiny accent multi color tourmaline stones all along the chain. The entire chain is in 14 karat yellow gold over sterling silver and has a secure, lobster-claw clasp. Chain lengths are 16, 18 and 20 inches.




Pink Crystals Bracelet

Pink Crystals Bracelet

Made with SWAROVSKI ELEMENTS. Made in Italy.




Blue Cubic Zirconia Sterling Silver Pendant Necklace

Blue Cubic Zirconia Sterling Silver Pendant Necklace

Add a touch of color to your look with Azhar's elegant egg-shaped pendant with a sparkling pave of blue cubic zirconia. Palliadium-treated sterling silver adds polish and shine. Total chain length 42 cm + 3 cm extension. Handmade in Italy.




Cubic Zirconia Bracelet

Cubic Zirconia Bracelet

The unique oblong shape of Azhar's sparkling cubic zirconia bracelet ensures a comfortable fit and maximum shine. A lift clasp snaps shut to secure it. Realized in .925 sterling silver. Handmade in Italy.




Black Diamond 18K Yellow Gold Eternity Band

Black Diamond 18K Yellow Gold Eternity Band

Seductive black diamonds adorn this beautiful ring perfect for the woman with contemporary elegance and classic refined tastes. 18 yellow gold and an elegant 4-prong setting create the ideal setting for optimum brilliance. CTW 1.07. Signature box included. Made in Italy.




Marina Collection - Blue Seashell Tourmaline & 18K Gold Pendant

Marina Collection - Blue Seashell Tourmaline & 18K Gold Pendant

Part of the Marina line by Tagliamonte this delicate and translucent pendant creates magic water light reflections and is an exclusive hand-made creation inspired by Venetian glass symbolic and naturalistic elements from the sea. The central seashell is made in blue vitreous paste and is adorned by a white pearl a sapphire and cabochon tourmaline adding a precious touch. Made in Italy. Gift box included




Marina Collection - Multicolor 18K Gold Bracelet

Marina Collection - Multicolor 18K Gold Bracelet

Part of the Marina line by Tagliamonte this delicate and translucent 18K gold bracelet creates magic water light reflections and is an exclusive hand-made creation inspired by Venetian glass symbolic and naturalistic elements from the sea. The starfish and shells are made in pastel vitreous paste and are alternated with astonishing 18K gold coral branches adding a precious final touch. Made in Italy. Gift box included




Double Gemstone and Diamond Yellow Gold Ring

Double Gemstone and Diamond Yellow Gold Ring

A vivid and warm embrace of precious tourmaline and amethyst gemstones in an 18K yellow gold prong setting is enriched by dazzling natural diamonds on a thin contoured band. Gift box included Made in Italy.




Ben-Amun - St. Tropez Embellished Clear Cuff

Ben-Amun - St. Tropez Embellished Clear Cuff

Brass Pewter 24K Gold Plating Resin Czech Glass Made in the USA Measurements: 3" L, 2.5" inside diameter. Ben-Amun's Resort collection, St. Tropez, channels the luscious colors and rich nautical elements that define the scenery of this French Riviera destination. With its reputation as the playground for the rich and famous think Brigitte Bardot frolicking on the beaches in the 50s and starlets sunning themselves on yachts designer Isaac Manevitz created jewelry that effortlessly transitions from a decadent pool to a champagne filled nightclub. Light-filled crystals, vibrant turquoise and warm golden chains are mixed with silken navy tassels and ropes to capture the feeling of a warm sun setting over the ocean paradise found! Please allow us 7 to 10 business days to process your order.




Ben-Amun - St. Tropez Wide Deco Bracelet

Ben-Amun - St. Tropez Wide Deco Bracelet

Pewter. 24K Gold Plating. Czech Glass. Box and Tongue Closure. Made in the USA. Measurements: 7"L, 2"W. Ben-Amuns Resort collection, St. Tropez, channels the luscious colors and rich nautical elements that define the scenery of this French Riviera destination. With its reputation as the playground for the rich and famous think Brigitte Bardot frolicking on the beaches in the 50s and starlets sunning themselves on yachts designer Isaac Manevitz created jewelry that effortlessly transitions from a decadent pool to a champagne filled nightclub. Light-filled crystals, vibrant turquoise and warm golden chains are mixed with silken navy tassels and ropes to capture the feeling of a warm sun setting over the ocean paradise found. Please allow us 7 to 10 business days to process your order.




Diamond and Onyx Flower 18K Gold Ring

Diamond and Onyx Flower 18K Gold Ring

Del Gatto's delicate flower ring juxtaposes a touch of feminine charm with sophisticated materials like onyx petals an 18K white gold setting and brilliant bezel-set 0.03 ct center diamond. Gift box included Made in Italy.





Artistic and exclusive watches

Oceanaut Men's Impulse Gold Watch

Oceanaut Men's Impulse Gold Watch

Oceanaut Men's Impulse Gold Watch Style: Casual Material: Stainless Steel Movement: Quartz Color: Gold Adjustable: Yes Shape: Round Dial Color: Black Date: Date




Suunto 3 Fitness Watch Gold

Suunto 3 Fitness Watch Gold

Suunto 3 Fitness Watch Gold Type: GPS Watches Color: Black Color Mapping: Black




Vestal Metronome Gold Black Watch

Vestal Metronome Gold Black Watch

Vestal Metronome Gold Black Watch Gender: Male Age: Adult Condition: New




Pyper Gold Tone Watch

Pyper Gold Tone Watch

Pyper Gold Tone Watch brings a sleek minimalist tone to your everyday wardrobe. Wear alone or stack for a personal flair. Featuring a 38mm gold tone round stainless steel case tonal dial with stick and crystal indices and three hand quartz movement. Gold tone bracelet with deployant clasp fastening. Water resistant to 5 ATM. Signature box included.




Toponi Officer Gold Watch

Toponi Officer Gold Watch

Toponi Officer Gold Watch takes inspiration from military watches with a unique offset dial and distinguished aesthetic that will be a favorite of your timepiece collection. Featuring 44mm round satiated 5N rose gold case back case opens to reveal movement protecting fumè sapphire back case glass and scratch resistant and anti reflection convex sapphire front glass. Black dial with numeral indices and seconds subdial. Two hand Unitas 6498 movement. Italian hand crafted leather strap with buckle closure. Water resistant to 5 ATM. Limited edition.




Ice-Watch Stone Gold Gold Dial Unisex watch #ST.GG.U.L.10

Ice-Watch Stone Gold Gold Dial Unisex watch #ST.GG.U.L.10

Ice-Watch Stone Gold Gold Dial Unisex watch #ST.GG.U.L.10 Style: Fashion Material: calfskin Movement: japanese-quartz Color: Multi-Color Shape: round Dial Color: Gold Dial Material: Mineral Display: Analog




Coconut Grove Stainless Steel Women's Watch

Coconut Grove Stainless Steel Women's Watch

Coconut Grove Golden Stainless Steel Women's Watch by Versus Versace is an elegant link style watch. Featuring silver tone stainless steel pyramid link bracelet with 21mm roundcase with detailed bezel black face with geometric pattern silver-tone stick indices two hands and logo with Quartz movement.Water resistant to 3 ATM.




Sea Fortune Diver - 18K Gold and Leather Watch

Sea Fortune Diver - 18K Gold and Leather Watch

A watch featuring an automatic mechanical movement and a uni-directional bezel engraved and enameled by hand with the lion logo and graduated for decompression timing. Closes with a 18K gold buckle. Gift box included. Italian Design Swiss made. Warranty: 24 months





Artistic apparel

Women's Stitched Silk Lined Red Italian Leather Gloves

Women's Stitched Silk Lined Red Italian Leather Gloves

A glamorous pair of red leather gloves embellished by white stitching and lined in silk to keep your hands warm and protected by adding a touch of Italian style. Handmade in Naples Italy




Women's Bright Blue Calf Leather Gloves w/ Silk Lining

Women's Bright Blue Calf Leather Gloves w/ Silk Lining

Bright blue Italian leather exudes a sumptuous luxury with bright contemporary style in line with current trends while silk lining ensures warmth and classy sophistication. Perfect whether out on the town or on your way to the office these soft calfskin gloves will keep you looking and feeling good. Made in Italy.




CLHEI - Lani in Black

CLHEI - Lani in Black

Description Introducing our fully polarized eyewear collection. The Lani combines excellent optical protection with a beautiful, classical frame style. Each pair ships with two colors of interchangeable lenses - one plain and one mirrored - perfect for life at the beach and in the city. Please select which color you would like installed in your sunglasses to begin with, and we will ship them with your choice of lens pre-installed. Design Details Polarized lenses with UVA and UVB 400 protection Natural ebony wood frame set Matte black metal detailing Includes interchangeable polarized lenses in grey and ocean blue (mirror) Laser-engraved detailing with limited edition number on frame leg Dimensions Lens width: 49mm Bridge width: 21mm Temple length: 145mm




CLHEI - Makani in Tortoiseshell

CLHEI - Makani in Tortoiseshell

Description Introducing our fully polarized eyewear collection. The Makani combines excellent optical protection with a bold, square frame style. Each pair ships with two colors of interchangeable lenses - one plain and one mirrored - perfect for life at the beach and in the city. Please select which color you would like installed in your sunglasses to begin with, and we will ship them with your choice of lens pre-installed. Design Details Polarized lenses with UVA and UVB 400 protection Natural ebony wood detailing Includes interchangeable polarized lenses in grey and copper-rose-gold (mirror) Laser-engraved detailing with limited edition number on frame leg Dimensions Lens width: 49mm Bridge width: 21mm Temple length: 145mm




CLHEI - Lani in Gold

CLHEI - Lani in Gold

Description Introducing our fully polarized eyewear collection. The Lani combines excellent optical protection with a beautiful, classical frame style. Each pair ships with two colors of interchangeable lenses - one plain and one mirrored - perfect for life at the beach and in the city. Please select which color you would like installed in your sunglasses to begin with, and we will ship them with your choice of lens pre-installed. Design Details Polarized lenses with UVA and UVB 400 protection Natural ebony wood frame set Gold metal detailing Includes interchangeable polarized lenses in grey and copper-rose-gold (mirror) Laser-engraved detailing with limited edition number on frame leg Dimensions Lens width: 49mm Bridge width: 21mm Temple length: 145mm




CLHEI - Makani in Ebony

CLHEI - Makani in Ebony

Description Introducing our fully polarized eyewear collection. The Makani combines excellent optical protection with a bold, square frame style. Each pair ships with two colors of interchangeable lenses - one plain and one mirrored - perfect for life at the beach and in the city. Please select which color you would like installed in your sunglasses to begin with, and we will ship them with your choice of lens pre-installed. Design Details Polarized lenses with UVA and UVB 400 protection Natural ebony wood detailing Includes interchangeable polarized lenses in grey and ocean blue (mirror) Laser-engraved detailing with limited edition number on frame leg Dimensions Lens width: 49mm Bridge width: 21mm Temple length: 145mm




Optical Woven Silk Tie

Optical Woven Silk Tie

Optical Woven Silk Tie crafted from 100% silk Jacquard features large woven multi-colored circles adding an eye-popping touch to your work suit. Logo keeper loop. Fully lined. Made in Italy.




Abstract Pattern Silk Tie

Abstract Pattern Silk Tie

Forzieri silk ties encompass classic Italian elegance for a refined man. Made in Italy.




Baccio Couture - Sussy Painted Velvet

Baccio Couture - Sussy Painted Velvet

Lace painted with metallic Silicone - Spandex velvet, crystallized with Swarovski elements.




Baccio Couture - Sade Mesh Painted

Baccio Couture - Sade Mesh Painted

Stretch mesh hand painted with metallic silicone. Caviar Glass texture.





Good sites to buy jewelry and watches

Fine jewelry of high quality, speciality are all types of diamond jewelry, engagement ring and wedding rings




Artistic Italian and European jewelry, fashion, watches and decore objects

Please click here to enter the shop -Forzieri.com

For people in America, please click here to enter the shop - Forzieri.com United States


Jewelry made of robust materials for active persons

Men's Accessories, money clips, cufflinks


Quality watches of famous brands, many for discounted prizes

Great Prices and Fast, FREE Shipping on Watches




Styly fashion for men and women and quality cosmetics for affordable prices

Urban style apparel for men and women

PERRY ELLIS 468x60 Logo


Elegant Latino style fashion for both sexes

CUBAVERA 234x60 Beach Wedding Apparel 40% Off


Casual and freetime style apparel for men and women
ORIGINAL PENGUIN 120x60 Logo


Beautiful apparel for women for every day life





Famous quality cosmetics for good prizes - also a lot of skin-care products to help against acne and other skin problems





At this page more good sources of fasion and shoes and some of their products are presented


To see more watch models and jewelry, please click at these links:

More watches and jewelry - page 1

Watches and jewelry - page 3

Watches and jewelry - page 4




INFORMATION RESOURCES

Here is some information about watches. To see a list of all information regarding watches, please click here


TECHNICAL CONSEPTS AND DEFINITIONS REGARDING CLOCKS, WATCHES  AND TIMING

Traditionally watches were mechanical devices. By the digital revolution in the seventies and the eighties, wholly digital watches were taking over the market because of the exactness and possibilities of functional variation that this technology offers. But soon it became clear that the old tchnology were far superior to the digital varianst regarding robustness, reliability, visibility and long durability. The producents of mechanical watches took up the fight and continued the development of the old technology in order to render the nearly the same exactness as digital watches. By now you can find watches with any degree of blending of electronic and mechanical technology. However, for high durability and reliability nothing beats a wholly mechanical watch of high quality. If durability and absolute zero failure rate is important, a wholy mechanical clock is still the choise.

High end watches often combine electronic and mechanical technology to get the best out of each one. The clock rate is typically controlled by a quarts crystal unit. The clock resceives timing signals from senders that the clock is adjusted against. Some bacic timing logic is electronic. However, the clock has mechanical arms and indicators driven by an electric motor and a mechanical clockwork.

Atomic clock: In an atomic clock a radio wave emitted form an atom is used to measure time exactly. All atoms absorb energy into their electron cloud, and emit energy again from their electron cloud in the shape of very short radio waves or light. These waves have only specific frequencies. Elements used in atomic clocks are cesium, rubidium and hydrogen.

The most common techology has a chamber with a gas containing the absorbing or emitting atoms. Then there is an electric oscilating circuit feeding to a micro wave emitter. The radio waves are fed into the chamber. This will cause the atoms in the chamber to absorb energy from the micro waves and emit that energy againg with their own specific frequencies. The intensity of the emitted micro waves from the chamber is measured at the same time as the frequency of the oscilating circuit is gradually tuned. When the microwaves emitted from the chamber is at its maximum, the frequency of the oscilating circuit is exactly the same as that of the emitted radiowaves. When this is achieved, the clock is tuned in, and the oscilations of the circuit is then used to feed a counter.

Up to now, atomic clocks have been bulky devices only suitable for use in laboratories. However, by now atomic clock chips have been made, and those will certainly appear in watches and other small clocks. The standard time of the world is based on a number of atomic clocks on different geografical locations, and that are syncronized against each other. The timing information from these clocks are transmitted to the whole world through a set of radio senders. In the international timing standards, radio wave frequencies from the element caesium is used. The exact definition of second is based on a radio frequency from this element.

Radio clock watches are often erronously called atomic watches.

Atomic clock sync (synchronization): Resceiving data about exact time from dedicated senders around the world. These time data are based on a few atomic clocks situated at different geographical locations and synchronized with each other. A radio clock is automatically adjusted from such signals. You can also get software to you PC that fetches time data based on the world's standard atomic clocks.

Automatic mechanical watches: Automatic watches use a fairly heavy-weighted rotor that will turn around because of its weight when the arm of the wearer moves, and this rotating movement will wind up the spring. 

Chronometer: A chronometer is any clock with negible distortions of the time indicated as long as the real time passes. Traditionally a clock with such an exactness that it could be used for navigational purposes at sea was called a chronometer. An exact enough watch is by this definition a chronometer. Traditionally clocks with a chronometer quality were used on ships and in aeroplanes for navigational purposes, and in laboratories.

Electronic watch: This is a watch where all the technology is electronic as timing impulse unit, timing logics and indicator system. However, in high end modern watches electronic and mechanical components are typically combined to get the best out of each technology.

Hybrid watches: In high end modern watches electronic and mechanical components are typically combined to get the best out of each technology.

Incablock: This is a system for protection of the mechanics of a watch against external impact. The stones and the pivots of sprockets and other rotating parts are monted in bearings with a spring mechanism capable of absorbing shock. When a mechanical shock occurs, the pivots and stones are pushed out of position, but agaist the resistance of the spring. During that movement the energy of the shock is absorbed. When the shock is over, the spring pćushes the pivot and the stones back in position again.

Manual mechanical watches: In these watches on winds the spring by turning a crown.

Quarts clock: In a quarts clock, a vibrating quarts crystal is used to control the speed of a clock. A quarts crystal lattice vibrates mechanically with a very high frequency if set in vibration. The distribution of electric charges within the chrystal is such that the mechanical vibration also creates an electric occilation in the chrystal. In a quarts clock, a quarts crystal is a part of an alternating current circuit, and in such a way that the frequency of the crystal occilations determines the current frequency.

The curcuit is also connected to other curcuits that transmit the occilations down to occilations of lower freequency. Ultimately through these circuits a mechanical pendulum is set in motion that drives the clock with a frequency that is a whole fraction of the quarts frequency, or the circuits are used to count up a digital counter. Many watches are quarts clocks or they use another type of mineralic crystal with the same function.

Mechanical watch: In a mechanical watch all the technical parts are made from moving mechanics. Generally a high quality mechanical watch is more robust, will last longer and is more reliable than an electronic watch.

Pendulum: The pendulum is controlling the speed of a clock. Mechanical watches have a pendulum combined with a spring. The pendulum typically has the shape of an occilating wheel. The energy source of the clock is connected to the pendulum and is keeping it swinging. This is done by giving the pendulum a push each time it is at one of the extremes of the swing. The pendulum is swinging with a constant rate. The pendulum transmits the energy further to the timing mechanics. For each swing, the pendulum pulls a gear foreward only one step. Thus the rate of the clock is controlled.

An electronic clock does not have a mechanic pendulum but it has something analogous. Typically it has a piezoelectric crystal, for example made of quartz. Such a crystal will be set in very rapid mechanical undulation of a constant frequency when subjected to osciliating electric fields with that frequency typical for the crystal. If the crystal allready is mechanically swinging, it will cause eletric fields that are swinging with the same frequency. The reason for this is that the electrons around the atoms in the crystal are not evenly distributed. A curcuit is set up such that the crystal will be subjected to a field in one specific direction when the structure of the crystal swings in one direction, and so that the current in the circuit is swiched to the other direction when the crystal swings back.  Then the circuit will get current that go back and forth with the same frequency that the crystal swings. This frequency of the current is then used to path the timing logic.

Radio clock or watch (often wrongly called atomic watch): A radio clock has electronic equipment that resceives radio signals from dedicated senders giving the exact time that the clock thereafter adjusts itself after. There are a few primary atomic clocks around the world that serves as prototypes for the time measurements in the whole world. These primary clocks are constantly synchronized against each other. These primary clocks transmit time signals to radio senders owned by different goverments or companies. A radio clock resceives signals from these senders.

Second - international standard definition: The second is currently defined as the duration of 9,192,631,770 periods of the radiation caused by the transition between the two hyperfine levels of the ground state of the caesium-133 atom.  The trasition must take place at a temperature of 0 K (absolute zero) and at zero magnetic field. The second thus defined is equivalent to the ephemeris second. The international standard symbol for a second is s (see ISO 31-1).

Stones or jewels: Hard smooth stones are used at the placed where sprockets, pivots or other rotating or moving parts inside the watch are suspended in order to reduce friction, to increase the exactness of the watch and to make the watch more durable. The function of the stones is comparable to that of bearings in larger mechanical equipment. Typically small rubine, safirs or other corundum stones are used because of the hardness of this mineral.

Tourbillon: A tourbillon is a mechanical device that counteracts variations of a clock's rate because of an variating gravitational friction within the mechanics of the clock. The weight of the mechanical parts within the clock creates friction, and this friction will to some degree determine the speed of a watch. But since the watch is not held constantly at the same position, this friction will be unpredictable, and it is therefore impossible to regulate the speed of the watch exactly.

A tourbillon is a rotating inner case that contains the mechanics of the watch. The rotation will make the averidge friction within the mechanics during a given time period constant, and the indicated time vill be less distorted from real time as the real time passes. By now there are other methods of giving exactness, so a tourbillon is not necessary any more. Watcing a rotating tourbillon is however entertaining. Fine watches are therefore sometimes made in such a way that the mechanics includes a tourbillon, and the mechanics is visible through a glass surface, so that the rotating tourbillon can be seen. By makeing the tourbillon rotating one round per minute, it also cam be used as a second pointer.