Public domain
Rating gasolines at the Bureau of Standards. Washington, D.C., April 17. F.R. Carter of the U.S. Bureau of Standards is shown adjusting the mixture of gasoline to find out the rating in octane numbers of gasolines. The three carburetor shown in the foreground are each filled with a gasoline tow of w
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineRating gasolines at the Bureau of Standards. Washington, D.C., April 17. F.R. Carter of the U.S. Bureau of Standards is shown adjusting the mixture of gasoline to find out the rating in octane numbers. 1937-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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