Pneumatic seals are used in rotary or reciprocating motion applications, such as pneumatic cylinders and valves. They require minimal lubrication and can handle high operating speeds but not high pressure. Composite seals made of different materials are often used. Sealing orientation can be internal, external, symmetrical, or axial. Rotating applications require single acting seals, while […]
Grease seals prevent liquid grease from escaping from automobile wheel bearing assemblies. They consist of a soft rubber or nylon ring embedded in a metal housing. Leather seals were used in early automobiles, but rubber seals are now preferred. It is important to replace seals when installing new wheel bearings, as a faulty seal can […]
Easter Seals is an organization that helps people with disabilities, using specially designed seals for fundraising. They offer medical care, job training, childcare, and recreational opportunities. The organization was founded in 1919 and changed its name to Easter Seals in 1952. They promote independence and support disability rights. 90% of donations go towards direct-to-client services. […]
Navy SEALs are part of the Naval Special Warfare (NSW) special operations force, making up just 1% of the US Navy. They are trained in land and air tactics, but begin and end their operations in the sea environment. Their primary training is in Special Reconnaissance (SR) and Direct Action (DA). Special Warfare Combatant Craft […]
Navy SEALs use a variety of weapons including the Colt M4A1 Carbine assault rifle, sniper rifles, shotguns, machine guns, pistols, grenade launchers, mortars, and rockets. The M4A1 is their weapon of choice and can be equipped with various features. They also use reserve pistols and the Benelli M4 Super 90 rifle. Sniper rifles include the […]
Elephant seals are large semi-aquatic mammals with two species: southern and northern. Males grow up to 16 feet long and weigh 6,000 pounds, while females are smaller. They have a loud roar and fight over harems during breeding season. They are the largest living member of the order Carnivora and can hold their breath for […]
Wafer seals are self-adhesive paper disks used to seal envelopes or prepare self-shipped materials for delivery. They were derived from sealing wax seals and were used for document protection. Today, they are sold in rolls and used for sealing bulky brochures or providing decorative seals for envelopes. They come in various styles and colors and […]
Christmas seals were created in 1903 by a Danish postmaster to raise money and awareness for tuberculosis. In 1907, an American woman borrowed the idea to save a hospital. Today, Christmas seals support the American Lung Association and fund research to stop lung disease. Many organizations offer seals, small stamps that are not valid postage, […]
The Book of Revelation in the Christian Bible describes a lamb opening a book sealed with seven seals, each causing an apocalyptic event. The interpretation of this story varies from literal to metaphorical, with disagreement among Christians and no definitive meaning. The seven seals are a set of elements referred to in the Book of […]
