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Gold chain with garnets, rock crystals and enamel from the 16th century, Sweden. Jewellery chains, jewelry chains or body chains are metal chains [1] [2] that are used in jewellery to encircle parts of the body, [3] namely the neck, wrists and ankles, [4] and they also serve as points to hang decorative charms and pendants. [5] [6] [7]
Chainrings (also called "chain rings", [11] "chainwheels" or "sprockets", although sprocket is used this way mostly in the BMX community [3]) engage the chain to transfer power to the (usually rear) wheel. They usually have teeth spaced to engage every link of the chain as it passes over; however, in the past, some designs (called skip-tooth or ...
The bail is normally placed in the center of the necklace where the pendant hangs. Some bails are made so a pendant can be attached after the necklace production is completed. This way, a necklace design can be mass-produced for multiple companies and the pendants can be attached after the necklaces are shipped to them. [2]
Now give the object 4 wheels. The normal force between the 4 wheels and axles is the same (in total) 981 N. Assume, for wood, μ = 0.25, and say the wheel diameter is 1000 mm and axle diameter is 50 mm. So while the object still moves 10 m the sliding frictional surfaces only slide over each other a distance of 0.5 m.
The chain is still used in agriculture: measuring wheels with a circumference of 0.1 chain (diameter ≈ 2.1 ft or 64 cm) are still readily available in Canada and the United States. For a rectangular tract, multiplying the number of turns of a chain wheel for each of two adjacent sides and dividing by 1,000 gives the area in acres.
1400–1500: During the Renaissance it was fashionable for men to wear a number of chains, plaques, and pendants around their necks, and by the end of the 15th century the wealthiest men would wear great, shoulder covering collars inlaid with gems. [4] Women typically wore simpler pieces, such as gold chains, or strung beads or pearls. [11]
In addition to basic forms of personal jewelry such as rings, necklaces, bracelets, and brooches that remain in use today, medieval jewelry often includes a range of other forms less often found in modern jewelry, such as fittings and fasteners for clothes including, buckles, "points" for the end of laces, and buttons by the end of the period ...
Modern tracks are built from modular chain links which together compose a closed chain. The links are jointed by a hinge, which allows the track to be flexible and wrap around a set of wheels to make an endless loop. The chain links are often broad, and can be made of manganese alloy steel for high strength, hardness, and abrasion resistance. [43]