A flashlight (more often called a torch outside North America) is a portable hand-held electric light. The source of the light is usually an incandescent light bulb or light-emitting diode (LED). A typical flashlight consists of a light bulb mounted in a reflector, a transparent cover (sometimes combined with a lens) to protect the light source and reflector, a battery, and a switch. These are supported and protected by a case.
The invention of the dry cell and miniature incandescent electric light bulbs made the first battery-powered flashlights possible around 1899. Today flashlights use mostly incandescent lamps or light-emitting diodes and run on disposable or rechargeable batteries. Some are powered by the user turning a crank or shaking the lamp, and some have solar panels to recharge a battery.
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A ballpoint pen, also known as a biro,[1] or ball pen, is a pen that dispenses ink over a metal ball at its point, i.e. over a “ball point”. The metal commonly used is steel, brass, or tungsten carbide.[2] It was conceived and developed as a cleaner and more reliable alternative to dip pens and fountain pens, and it is now the world’s most-used writing instrument:[3] millions are manufactured and sold daily.[4] As a result, it has influenced art and graphic design and spawned an artwork genre.
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Tin is a chemical element with symbol Sn (from Latin: stannum) and atomic number 50. It is a post-transition metal in group 14 of the periodic table. It is obtained chiefly from the mineralcassiterite, which contains tin dioxide, SnO2. Tin shows a chemical similarity to both of its neighbors in group 14, germanium and lead, and has two main oxidation states, +2 and the slightly more stable +4. Tin is the 49th most abundant element and has, with 10 stable isotopes, the largest number of stable isotopes in the periodic table, thanks to its magic number of protons. It has two main allotropes: at room temperature, the stable allotrope is β-tin, a silvery-white, malleable metal, but at low temperatures it transforms into the less dense grey α-tin, which has the diamond cubic structure. Metallic tin is not easily oxidized in air.
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A ballpoint pen, also known as a biro,[1] or ball pen, is a pen that dispenses ink over a metal ball at its point, i.e. over a “ball point”. The metal commonly used is steel, brass, or tungsten carbide.[2] It was conceived and developed as a cleaner and more reliable alternative to dip pens and fountain pens, and it is now the world’s most-used writing instrument:[3] millions are manufactured and sold daily.[4] As a result, it has influenced art and graphic design and spawned an artwork genre.
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X-Acto is a brand name for a variety of cutting tools and office products owned by Elmer’s Products, Inc. Cutting tools include hobby and utility knives, saws, carving tools and many small-scale precision knives used for crafts and other applications.
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SRAM Corporation is a privately owned bicycle component manufacturer based in Chicago, Illinois, United States, founded in 1987.[2] SRAM is an acronym comprising the names of its founders, Scott, Ray, and Sam, (where Ray is the middle name of company head Stan Day).[2] The company is known for producing cycling components, including some internally developed, such as Grip Shift, EAGLE (1×12), DoubleTap, dedicated 1×11 mountain and road drivetrains and SRAM Red eTap.[3][4][5]
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SRAM Corporation is a privately owned bicycle component manufacturer based in Chicago, Illinois, United States, founded in 1987.[2] SRAM is an acronym comprising the names of its founders, Scott, Ray, and Sam, (where Ray is the middle name of company head Stan Day).[2] The company is known for producing cycling components, including some internally developed, such as Grip Shift, EAGLE (1×12), DoubleTap, dedicated 1×11 mountain and road drivetrains and SRAM Red eTap.[3][4][5]
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SRAM Corporation is a privately owned bicycle component manufacturer based in Chicago, Illinois, United States, founded in 1987.[2] SRAM is an acronym comprising the names of its founders, Scott, Ray, and Sam, (where Ray is the middle name of company head Stan Day).[2] The company is known for producing cycling components, including some internally developed, such as Grip Shift, EAGLE (1×12), DoubleTap, dedicated 1×11 mountain and road drivetrains and SRAM Red eTap.[3][4][5]
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SRAM Corporation is a privately owned bicycle component manufacturer based in Chicago, Illinois, United States, founded in 1987.[2] SRAM is an acronym comprising the names of its founders, Scott, Ray, and Sam, (where Ray is the middle name of company head Stan Day).[2] The company is known for producing cycling components, including some internally developed, such as Grip Shift, EAGLE (1×12), DoubleTap, dedicated 1×11 mountain and road drivetrains and SRAM Red eTap.[3][4][5]
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SRAM Corporation is a privately owned bicycle component manufacturer based in Chicago, Illinois, United States, founded in 1987.[2] SRAM is an acronym comprising the names of its founders, Scott, Ray, and Sam, (where Ray is the middle name of company head Stan Day).[2] The company is known for producing cycling components, including some internally developed, such as Grip Shift, EAGLE (1×12), DoubleTap, dedicated 1×11 mountain and road drivetrains and SRAM Red eTap.[3][4][5]
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Common roller bearings use cylinders of slightly greater length than diameter. Roller bearings typically have higher radial load capacity than ball bearings, but a lower capacity and higher friction under axial loads. If the inner and outer races are misaligned, the bearing capacity often drops quickly compared to either a ball bearing or a spherical roller bearing.
