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Prof. Chas. F. Marvin, Chief of U.S. Weather Bureau, with recording mercurial barograph, an instrument made and perfected by the bureau under his supervision, measuring on a magnified scale the fluctuations in the pressure of the air
Public domain

Prof. Chas. F. Marvin, Chief of U.S. Weather Bureau, with recording mercurial barograph, an instrument made and perfected by the bureau under his supervision, measuring on a magnified scale the fluctuations in the pressure of the air

Harris & Ewing · 1924-01-01 · photo, print, drawing

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

Subjects
glass negativesunited states
Credit lineProf. Chas. F. Marvin, Chief of U.S. Weather Bureau, with recording mercurial barograph, an instrument made and perfected by the bureau under his supervision, measuring on a magnified scale the fluctu. 1924-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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