Arkivism
Man with a Riefler pendulum clock, the primary standard for time interval measurements from 1904 to 1929
Public domain

Man with a Riefler pendulum clock, the primary standard for time interval measurements from 1904 to 1929

Harris & Ewing · 1936-01-01 · photo, print, drawing

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

Subjects
glass negativesunited states
Credit lineMan with a Riefler pendulum clock, the primary standard for time interval measurements from 1904 to 1929. 1936-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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