bicycle helmet how often to replace image
glidefloss
never had any fall impact, but just want to make sure its in good shape if i do. does the foam degrade over time? whats the good rule of thumb for how often you should replace one?
thank you!!!
Answer
if you've fallen on it or dropped it, replace it. otherwise, replace every 3 years.
if you've fallen on it or dropped it, replace it. otherwise, replace every 3 years.
What is a good project topic?
heybabe
in geography i have to do this project called "the geography of..." and you basically pick any item and find out where it originated and where it diffused to over time. i don't know what to choose! any suggestions will be appreciated!
Answer
The Geography of...
-The Carousel:
A carousel, or merry-go-round, is an amusement ride consisting of a rotating circular platform with seats for riders. The "seats" are traditionally in the form of rows of wooden horses or other animals mounted on posts, many of which are moved up and down via gearwork to simulate galloping, to the accompaniment of looped circus music. Modern carousels in America are generally populated with horses. Carousels in Europe, and in America from earlier periods, frequently include diverse varieties of mounts, like pigs, zebras, mythological creatures (such as dragons, sea monsters or unicorns), and deer, to name a few.
Origin of The Carousel:
The earliest known depiction of a carousel is in a Byzantine bas-relief dating to around 500 A.D., which depicts riders in baskets suspended from a central pole. The word carousel originates from the Italian garosello and Spanish carosella ("little war"), used by crusaders to describe a combat preparation exercise and game played by Turkish and Arabian horsemen in the 1100s. In a sense this early device could be considered a cavalry training mechanism; it prepared and strengthened the riders for actual combat as they wielded their swords at the mock enemies. European Crusaders discovered this device and brought the idea back to their own lands. A carousel was also a training device for the ring-tilt, consisting of wooden horses suspended from arms branching from a center pole. Riders aimed to spear rings situated around the circumference as the carousel was moved by a man, horse, or mule. Carousel was also the term for large "horse ballet" or Musical Ride spectacles mounted as part of the court festivities for special occasions such as royal weddings or state visits from the mid-16th century onwards, which gradually replaced serious jousting, although non-combat competitrions such as the ring-tilt lasted until the 18th century. They were developed in Italy, especially by the Medici Grand-Dukes in Florence, and the first French example was in Paris in 1605. These usually took place in squares or large courtyards, and consisted of elaborately costumed riders and horses (usually from the cavalry) performing choreographed routines such as forming shapes together, riding in lines criss-cross against each other. They often took place at night, with riders carrying torches, and were accompanied by music. From the 17th century large decorated floats with allegorical figures were often included. The Place du Carrousel in Paris was so named from 1662, when it was used for such a display by Louis XIV.
http://en.wikipedia.org/wiki/Carousel
-The Flashlight:
A flashlight (called a torch outside North America) is a portable electric spotlight that emits light from a small incandescent lightbulb or from one or more light-emitting diodes (LEDs). Typical flashlight designs usually consist of the light source located in a housing containing a parabolic reflector or specially shaped lens to shape the flashlight beam, a transparent window to protect the light source from damage and debris, a power source (typically electric batteries), and an electric power switch. While most flashlights are intended to be hand-held, there are also helmet-mounted flashlights designed for miners and campers and battery-powered lights for bicycles. Some flashlights are powered by hand-cranked dynamos or electromagnetic induction or are recharged by solar power. The name flashlight is used mainly in the United States and Canada. In other English-speaking countries, the more common term is torch or electric torch.
Origin of The Flashlight:
On 10 January 1899, American Electrical Novelty and Manufacturing Company obtained U.S. Patent No. 617,592 (filed 12 March 1898) from David Misell, an inventor. This "electric device" designed by Misell was powered by "D" batteries laid front to back in a paper tube with the light bulb and a rough brass reflector at the end. The company donated some of these devices to the New York City police, who responded favorably to them. These early flashlights ran on zincâcarbon batteries which were incapable of providing a steady source of electric current and needed to be 'rested' periodically to continue functioning. Because these early flashlights also used energy-inefficient carbon-filament bulbs, this occurred at short intervals. Consequently, they could be used only in brief flashes, hence the popular name flashlight.
http://en.wikipedia.org/wiki/Flashlight
-The Necktie:
The necktie (or tie) is a long piece of cloth worn around the neck or shoulders, resting under the shirt collar and knotted at the throat. Variants include the bow tie, ascot tie, bolo tie, and the clip-on tie. The modern necktie, ascot, and bow tie are descended from the cravat.
Origin of The Necktie:
The necktie traces back to the time of Thirty Years' War (1618â1648) when Croatian mercenaries from the Military Frontier in French service, wearing their traditional small, knotted neckerchiefs, aroused the interest of the Parisians. Due to the slight difference between the Croatian word for Croats, Hrvati, and the French word, Croates, the garment gained the name "Cravat". The new article of clothing started a fashion craze in Europe where both men and women wore pieces of fabric around their necks. In the late seventeenth century, the men wore lace cravats that took a large amount of time and effort to arrange. These cravats were often tied in place by cravat strings, arranged neatly and tied in a bow.
http://en.wikipedia.org/wiki/Necktie
The Geography of...
-The Carousel:
A carousel, or merry-go-round, is an amusement ride consisting of a rotating circular platform with seats for riders. The "seats" are traditionally in the form of rows of wooden horses or other animals mounted on posts, many of which are moved up and down via gearwork to simulate galloping, to the accompaniment of looped circus music. Modern carousels in America are generally populated with horses. Carousels in Europe, and in America from earlier periods, frequently include diverse varieties of mounts, like pigs, zebras, mythological creatures (such as dragons, sea monsters or unicorns), and deer, to name a few.
Origin of The Carousel:
The earliest known depiction of a carousel is in a Byzantine bas-relief dating to around 500 A.D., which depicts riders in baskets suspended from a central pole. The word carousel originates from the Italian garosello and Spanish carosella ("little war"), used by crusaders to describe a combat preparation exercise and game played by Turkish and Arabian horsemen in the 1100s. In a sense this early device could be considered a cavalry training mechanism; it prepared and strengthened the riders for actual combat as they wielded their swords at the mock enemies. European Crusaders discovered this device and brought the idea back to their own lands. A carousel was also a training device for the ring-tilt, consisting of wooden horses suspended from arms branching from a center pole. Riders aimed to spear rings situated around the circumference as the carousel was moved by a man, horse, or mule. Carousel was also the term for large "horse ballet" or Musical Ride spectacles mounted as part of the court festivities for special occasions such as royal weddings or state visits from the mid-16th century onwards, which gradually replaced serious jousting, although non-combat competitrions such as the ring-tilt lasted until the 18th century. They were developed in Italy, especially by the Medici Grand-Dukes in Florence, and the first French example was in Paris in 1605. These usually took place in squares or large courtyards, and consisted of elaborately costumed riders and horses (usually from the cavalry) performing choreographed routines such as forming shapes together, riding in lines criss-cross against each other. They often took place at night, with riders carrying torches, and were accompanied by music. From the 17th century large decorated floats with allegorical figures were often included. The Place du Carrousel in Paris was so named from 1662, when it was used for such a display by Louis XIV.
http://en.wikipedia.org/wiki/Carousel
-The Flashlight:
A flashlight (called a torch outside North America) is a portable electric spotlight that emits light from a small incandescent lightbulb or from one or more light-emitting diodes (LEDs). Typical flashlight designs usually consist of the light source located in a housing containing a parabolic reflector or specially shaped lens to shape the flashlight beam, a transparent window to protect the light source from damage and debris, a power source (typically electric batteries), and an electric power switch. While most flashlights are intended to be hand-held, there are also helmet-mounted flashlights designed for miners and campers and battery-powered lights for bicycles. Some flashlights are powered by hand-cranked dynamos or electromagnetic induction or are recharged by solar power. The name flashlight is used mainly in the United States and Canada. In other English-speaking countries, the more common term is torch or electric torch.
Origin of The Flashlight:
On 10 January 1899, American Electrical Novelty and Manufacturing Company obtained U.S. Patent No. 617,592 (filed 12 March 1898) from David Misell, an inventor. This "electric device" designed by Misell was powered by "D" batteries laid front to back in a paper tube with the light bulb and a rough brass reflector at the end. The company donated some of these devices to the New York City police, who responded favorably to them. These early flashlights ran on zincâcarbon batteries which were incapable of providing a steady source of electric current and needed to be 'rested' periodically to continue functioning. Because these early flashlights also used energy-inefficient carbon-filament bulbs, this occurred at short intervals. Consequently, they could be used only in brief flashes, hence the popular name flashlight.
http://en.wikipedia.org/wiki/Flashlight
-The Necktie:
The necktie (or tie) is a long piece of cloth worn around the neck or shoulders, resting under the shirt collar and knotted at the throat. Variants include the bow tie, ascot tie, bolo tie, and the clip-on tie. The modern necktie, ascot, and bow tie are descended from the cravat.
Origin of The Necktie:
The necktie traces back to the time of Thirty Years' War (1618â1648) when Croatian mercenaries from the Military Frontier in French service, wearing their traditional small, knotted neckerchiefs, aroused the interest of the Parisians. Due to the slight difference between the Croatian word for Croats, Hrvati, and the French word, Croates, the garment gained the name "Cravat". The new article of clothing started a fashion craze in Europe where both men and women wore pieces of fabric around their necks. In the late seventeenth century, the men wore lace cravats that took a large amount of time and effort to arrange. These cravats were often tied in place by cravat strings, arranged neatly and tied in a bow.
http://en.wikipedia.org/wiki/Necktie
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Title Post: HOW often should you replace a bicycle helmet???
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