Public domain
Scrubbing Research. D.E. Kessler, of the Bureau of Standards is conducting experiments to determine the effect of different washing materials upon marble. Thirty-six pieces of the stone are attached to the big wheel, each piece receiving a ten minute scrubbing.
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Subjects
Credit lineScrubbing Research. D.E. Kessler, of the Bureau of Standards is conducting experiments to determine the effect of different washing materials upon marble. Thirty-six pieces of the stone are attached t. 1925. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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