igniting
41Orion Nebula — The entire Orion Nebula in visible light. Credit: NASA/ESA Observation data: J2000 epoch …
42Pyrotechnics — The term pyrotechnics can also be used for fireworks events. Pyrotechnics is the science of materials capable of undergoing self contained and self sustained exothermic chemical reactions for the production of heat, light, gas, smoke and/or sound …
43Doomsday device — This article is about the theoretical world ending destruction. For the professional wrestling maneuver, see Doomsday Device. Doomsday machine redirects here. For other uses, see Doomsday machine (disambiguation). Many hypothetical doomsday… …
44Wheellock — Wheellock, wheel lock or wheel lock, is a mechanism for firing a firearm. It was the next major development in firearms technology after the matchlock and the first self igniting firearm. The mechanism is so called because it uses a rotating… …
45Heckler & Koch G11 — Infobox Weapon name=Heckler Koch G11 caption=G11 origin=flagcountry|West Germany type=Assault rifle is ranged=yes service= used by= wars= designer=Heckler Koch design date= manufacturer= production date= number= variants= weight=3.6 kg (8.0 lbs.) …
46National Electrical Code — The National Electrical Code, 2008 edition The National Electrical Code (NEC), or NFPA 70, is a regionally adoptable standard for the safe installation of electrical wiring and equipment. The NEC, while having no legally binding regulation as… …
47Collapse of the World Trade Center — Coordinates: 40°42′41.12″N 74°00′44.00″W / …
48Vertical launching system — For the Brazilian Space Agency launcher, see VLS 1. The VLS cells on board USS San Jacinto …
49Internal ballistics — Internal ballistics, a subfield of ballistics, is the study of a projectile s behavior from the time its propellant s igniter is initiated until it exits the gun barrel. The study of internal ballistics is important to designers and users of… …
50Slow match — or match cord is the very slow burning cord or twine fuse used by early gunpowder musketeers, artillerymen, and soldiers to ignite matchlock muskets, cannons, and petards. Slow matches were most suitable for use around black powder weapons… …
