images

The Clark refractor, Lowell Observatory

by

Stefan Seip/Novapix

Reference

o-low02-00001

Date

2007-06-21

This Alvan Clark 24-Inch refractor was purchased by Percival Lowell and installed at Flagstaff, Arizona, in 1897. Lowell used this refractor for studying Mars. In 1912, Vesto Slipher was the first to observe the galactic redshifts. This telescope is still in use today for public education.