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Naval observatory transit telescope which observes the "Clock Stars" [...] secure[?] the time[?
Public domain

Naval observatory transit telescope which observes the "Clock Stars" [...] secure[?] the time[?

1909-01-01 · photo, print, drawing

From the collection of Library of Congress. Free to download, adapt and use — no permission needed.

Subjects
glass negatives
Credit lineNaval observatory transit telescope which observes the "Clock Stars" [...] secure[?] the time[?. 1909-01-01. National Photo Company Collection, Library of Congress. Public domain.
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