[1] Lick Director, James Edward Keeler, remarked of the Crossley in 1900, "... by far the most effective instrument in the Observatory for certain class of astronomical work.

[1] Meanwhile, at the Lick Observatory in California, Edward S. Holden, the director, learned that Crossley wanted to sell the well-regarded Common 36-inch telescope.

[4] Crossley was very impressed by the enhanced observing conditions at Mount Hamilton, and, in April 1895, he formally telegraphed the Lick that he would donate the telescope.

[5] The reflecting telescope type was scarcely used in the United States at the time of the donation, with a noted exception being the work of H. Draper's reflector.

[9] Perrine would use the rebuilt Crossley to great effect in discovering eight comets[10][11] and the sixth and seventh satellites (moons) of Jupiter.

[12] The Crossley was so effective that when Perrine became the director of the Argentine National Observatory in Cordoba in 1909, he established a program to install a 60-inch (76-centimeter) reflecting telescope in Argentina.

[14] Nicholas Mayall was a long time user of the Crossley and added a slitless spectrograph to extend its usefulness in the face of larger telescopes.

[16] In 1900, Assistant Astronomer Charles Dillon Perrine took hundreds of photographs of the near-Earth asteroid 433 Eros for the determination of the solar parallax.