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An incantation, spell, charm, enchantment, or bewitchery is a magical formula intended to trigger a magical effect on a person or objects. The formula can be spoken, sung, or chanted . An incantation can also be performed during ceremonial rituals or prayers .
The mercenary Deathstroke wears armor made of Nth metal. Octiron Discworld: A strange, iridescent metal; highly valued. Radiates dangerous amounts of raw enchantment and is so unstable it can only exist in a universe saturated with raw magic. [57] Orichalcum: Mythology of Atlantis: Pink or red metal mined in Atlantis; also called mountain ...
by ventilatory driving force: the breathing effort of the user, or mechanical work from an external source, by gas mixture: air, oxygen enriched, or pure oxygen. The user respiratory interface is the delivery system by which the breathing apparatus guides the breathing gas flow to and from the user. Some form of facepiece, hood or helmet is usual.
A breathing helmet is usually defined as a rigid respiratory user interface covering the head that also provides head protection against impact and penetration. [33] In medical terminology, a breathing helmet is synonymous with a breathing hood, and need not have any rigid protective structure. [36] [27]
Close fitting helmet with a characteristic Y- or T-shaped slit for vision and breathing, reminiscent of ancient Greek helmets Armet: 15th: A bowl helmet that encloses the entire head with the use of hinged cheek plates that fold backwards. A gorget was attached and a comb may be present. May also have a rondel at the rear. Later armets have a ...
Samantha Cristoforetti demonstrating the use of the Valsalva device in the Sokol space suit. The Valsalva device is a device used in spacesuits, some full face diving masks and diving helmets to allow astronauts and commercial divers to equalize the pressure in their ears by performing the Valsalva maneuver inside the suit without using their hands to block their nose.
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Hypersonic cruise missile: cruise missiles which use air-breathing engines such as scramjets to reach high speeds [3] [1] Hypersonic aircraft using air-breathing engines such as scramjets to reach high speeds [1] Guns which fire cannon-launched guided projectiles. These may be developments of traditional artillery or novel technologies such as ...