You are here: Home USNO James M. Gilliss Library Historical Photos, Artwork, Objects Historical Collection Portraits George N. Saegmuller
The USNO websites,,,,, and are undergoing modernization efforts. The expected completion of the work and return of service is estimated as 30 April 2020. Please submit a requirements form to the USNOPAO if the information you are seeking is not accessible via other means.

George N. Saegmuller

George N. Saegmuller (1847-1934) was an instrument maker in the Washington, D.C. area. He is best known at the Naval Observatory for manufacturing the mounting of the 12-inch refractor, which stands atop its main building today. The mounting had been completed in November, 1892, but because the 12-inch lens was not yet completed, the old 9.6-inch refractor was mounted first. On December 19, 1895 the 9.6-inch objective was replaced with the 12-inch lens, with a focal length of 15 feet. The 12-inch refractor with Saegmuller's mounting is used today by numerous visitors on the popular Monday night tours. Gift of Saegmuller Family
USNO Master Clock Time
Javascript must be Enabled