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physical object > artifact > device > instrument > telescope > electromagnetic telescope > optical telescope > refractor

refractor
subject			fact

refractor	has lens maker the person, company or institution that created the lens
	has lens type doublet
	has optical design visual refractor
	has definition A telescope in which the light is focused by a lens at the viewing side of the telescope. By contrast, a reflecting telescope is one in which light is focused by a mirror.
	has definition Telescope that uses lenses to magnify and focus an image onto an eyepiece. (refractor)
	has definition A device for gathering and amplifying light by means of a lens.
	is a kind of optical telescope
optical telescope	has reference astroweb
telescope	has wavelength sensitivity
	has angular resolving power
	has effective diameter
	has aperture
	has focal ratio
	has operator
	has purpose observe celestial objects
	has location
artifact	has creator
	has creation date
	has owner
physical object	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of refractor :

• 26-inch Equatorial (12 facts)
• 28-inch Visual Refractor (14 facts) (Greenwich refractor)
• 36-inch Refractor (14 facts) (36 inch)
• Grosser Refraktor (12 facts)
• Grosser Refraktor^2 (12 facts)
• Lunette Bischoffscheim (12 facts)
• McCormick Refractor (13 facts) (26 inch)
• Meudon Refractor (13 facts) (33 inch)
• Potsdam Refractor (12 facts)
• The Thaw Refractor (15 facts) (30 inch)
• Thompson Refractor (12 facts)
• Yerkes 40-inch Refractor (15 facts) (40 inch)

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