One of four photographs showing two views of the filar micrometer for the 40-inch Yerkes refracting telescope

One of four photographs mounted in glazed museum frame showing two views of the filar micrometer for the 40-inch Yerkes refracting telescope, at Williams Bay; Wisconsin; USA.

Details

Category:
Astronomy
Object Number:
1915-585/4
Materials:
paper (fibre product), cardboard, wood (unidentified), glass and complete
type:
photograph
credit:
Warner & Swasey Co