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physical object > artifact > device > instrument

instrument
subject			fact

instrument	has operator
	has definition a device that requires skill for proper use
	is a kind of device
artifact	has creator
	has creation date
	has purpose
	has owner
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of instrument :

• artificial satellite (80 kinds, 194 facts) - a satellite made by humans which is gravitationaly bound and in orbit of a larger physical object
• fusion device (5 kinds, 11 facts)
• high energy detector (5 kinds, 12 facts) - Device for recording the presence of subatomic particles. A typical modem detector consists of an array of electronic sensors connected to a computer, capable of recording the paths of the particles as they fly out from the collision site in a particle accelerator.
• optical device (90 kinds, 204 facts)
• particle accelerator (3 kinds, 9 facts) - A device using electric and magnetic fields to accelerate beams of particles-usually electrons, positrons, protons, or antiprotons-to high energies for experimental purposes. Modern accelerators are often very large: the main ring at Fermilab, for example, is 4 miles in circumference., A machine for speeding subatomic particles to high velocity, then colliding them with a stationary target or with another beam of particles moving in the opposite direction. (In the latter instance, the machine may be called a collider.) At velocities approaching that of light the mass of the particles increases dramatically, adding greatly to the energy released on impact. The resulting explosion promotes the production of exotic particles, which are analyzed according to their behavior as they fly away through a particle detector.
• telescope (123 kinds, 1164 facts) - A device for gathering and amplifying light or X rays, gamma rays, or other forms of energy.

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