The Hamilton echelle spectrograph is an astronomical cross-dispersed echelle spectrograph at Lick Observatory. An echelle grating provides high spectral dispersion and a prism separates overlapping diffraction orders in the perpendicular direction. The observatory lists feeds from the Shane and Coudé Auxiliary telescopes.[ref]
Spectrograph Synopses by University of California Observatories. Hamilton echelle spectrograph entry: prism cross-dispersion and telescope feeds
The resulting charge-coupled device image contains several strips of optical spectrum, rather than one continuous line. A wavelength reference must locate the spectral lines in these strips before small line displacements can be interpreted as a Doppler shift.
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