Arkivism
Johnson with Earth inductor
Public domain

Johnson with Earth inductor

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 lineJohnson with Earth inductor. 1936-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
Open in Explore View at source

Similar works

Dr. W.F. Wallis and MagnemometerDr. W.F. Wallis and Magnemometer 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.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. No captionNo caption Traffic paint undergoes rigid tests. Washington, D.C., April 16. At the U.S. Bureau of Standards, J.E. Keefauver of the Bureau has been running tests on the paint that is placed on safety zones and streets to determine which has the best wearing activity. The discs [?] are painted with the traffic pTraffic paint undergoes rigid tests. Washington, D.C., April 16. At the U.S. Bureau of Standards, J.E. Keefauver of the Bureau has been running tests on the paint that is placed on safety zones and streets to determine which has the best wearing activity. The discs [?] are painted with the traffic p Production. Naval gun mounts. A mount ring for a big naval gun is checked as skilled workers in a large Midwest machine shop complete layouts work that guides later machining operations. Westinghouse, Louisville, KentuckyProduction. Naval gun mounts. A mount ring for a big naval gun is checked as skilled workers in a large Midwest machine shop complete layouts work that guides later machining operations. Westinghouse, Louisville, Kentucky Child with armillary sphere, Meridian Hill Park, Washington, D.C.Child with armillary sphere, Meridian Hill Park, Washington, D.C.