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physical object > artifact > device > instrument > optical device > wavefront modifier > spectrograph dispersing element > diffraction grating > echelle

echelle
subject			fact

echelle	has definition A type of diffraction grating with groove angles of 90°. With the grating at an angle of 45° the grooves resemble a staircase.
	is a kind of diffraction grating
spectrograph dispersing element	has dispersion
	has wavefront modification wavelength
instrument	has operator
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

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