Vesto Slipher (1875 - 1969)

Slipher looking into the three-prism spectroscope attached to the 24 inch Alvin Clark refractor at Lowell observatory.


Sketch of prism spectrograph.


A multi-prism spectroscope: The telescope collimator on the right feeds light into the first of a series of prisms, which ultimately feed the dispersed light into the eyepiece on the left.