One of two photographs showing a transit instrument by Ertel and a mural circle made by Troughton and Simms

One of two photographs showing a transit instrument by Ertel and a mural circle made by Troughton and Simms at the U.S. Naval Observatory, Washington.

Details

Category:
Astronomy
Object Number:
1876-373/2
Materials:
paper
type:
photograph, mural circle and transit instrument
credit:
United States Naval Observatory