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The delta L problem (ΔL problem) refers to certain firearm chambers and the incompatibility of some ammunition made for that chamber. ΔL is a Commission Internationale Permanente (C.I.P.) geometric dimensioning and tolerancing definition for cartridge cases that are longer than the chamber they have to fit in. "Delta L" essentially means "difference in length".
The Williams cleaner bullet, also known as "cleaner bullets", refers to three different types of bullets that were used by the Union Army during the American Civil War in the standard .58 caliber rifle muskets. There was a fourth developed for use in the Union Repeating or "Coffee-Mill" gun.
Most Arctic Warfare rifles are chambered for the 7.62×51mm NATO cartridge, but Accuracy International also made variants of the sniper rifle, the AWM (Arctic Warfare Magnum) chambered either for the .300 Winchester Magnum and the .338 Lapua Magnum and the AW50 (Arctic Warfare .50 calibre) chambered for the .50 BMG (12.7×99mm NATO).
Snipers of Beredskapstroppen Delta of the Norwegian Police have also been seen with this rifle. [30] South Korea: Used by the 707th Special Mission Group. [31] Ukraine: Snipers in the AFU have been reported to be using MRAD rifles. [32] [33] United States: MK 22 MOD 0 Advanced Sniper Rifle (ASR) ordered by the U.S. Special Operations Command. [13]
Ultrapure water (UPW), high-purity water or highly purified water (HPW) is water that has been purified to uncommonly stringent specifications. Ultrapure water is a term commonly used in manufacturing to emphasize the fact that the water is treated to the highest levels of purity for all contaminant types, including: organic and inorganic compounds; dissolved and particulate matter; volatile ...
The original Bernoulli Alpha drive spins a PET film floppy disk at about 1500 rpm, [1] 1 μm over a read-write head, using Bernoulli's principle to pull the flexible disk towards the head as long as the disk is spinning.
An N95 respirator is a disposable filtering facepiece respirator or reusable elastomeric respirator filter that meets the U.S. National Institute for Occupational Safety and Health (NIOSH) N95 standard of air filtration, filtering at least 95% of airborne particles that have a mass median aerodynamic diameter of 0.3 micrometers under 42 CFR 84, effective July 10, 1995.
A fountain pen is a writing instrument that uses a metal nib to apply water-based ink, or special pigment ink—suitable for fountain pens—to paper.It is distinguished from earlier dip pens by using an internal reservoir to hold ink, eliminating the need to repeatedly dip the pen in an inkwell during use.