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Substitute fuels tested. Conducting an experiment to determine whether engine wear is increased by the use of fuel substitutes, Emmet L. Reed of Washington, D.C. makes an identification mark on the cylinder of an automobile engine. The rate of the mark's disappearance will determine the degree of wear. This is part of the "ersatz" fuel experiments which are being conducted at the U.S. Bureau of Standards

Substitute fuels tested. Conducting an experiment to determine whether...

Picryl description: Public domain photograph of the 1930s - 1940s, woman, female portrait, United States, free to use, no copyright restrictions.

Nathaniel P. Banks to Abraham Lincoln (?), Thursday, August 22, 1861  (Disappearance of Captain Smith and military affairs)
Nathaniel P. Banks to Abraham Lincoln (?), Thursday, August 22, 1861  (Disappearance of Captain Smith and military affairs)
Nathaniel P. Banks to Abraham Lincoln (?), Thursday, August 22, 1861  (Disappearance of Captain Smith and military affairs)
Nathaniel P. Banks to Abraham Lincoln (?), Thursday, August 22, 1861  (Disappearance of Captain Smith and military affairs)
Nathaniel P. Banks to Abraham Lincoln (?), Thursday, August 22, 1861  (Disappearance of Captain Smith and military affairs)
Soliloquy of Prof. John W. Webster, after the disappearance of Dr. Geo. Parkman up to the time of his execution. By Mary G. Doe. [Aug. 1850].