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Dr. E. Francis Warren, of Harvard U., believes he will be able to "shoot down" the heaviest clouds and fog by his new invention demonstrated recently at Bolling Field, Wash., by Army fliers. The process uses sand and he states that if enough airplanes are equipped with this device, it will not only
Public domain

Dr. E. Francis Warren, of Harvard U., believes he will be able to "shoot down" the heaviest clouds and fog by his new invention demonstrated recently at Bolling Field, Wash., by Army fliers. The process uses sand and he states that if enough airplanes are equipped with this device, it will not only

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

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

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glass negativesunited states
Credit lineDr. E. Francis Warren, of Harvard U., believes he will be able to "shoot down" the heaviest clouds and fog by his new invention demonstrated recently at Bolling Field, Wash., by Army fliers. The proce. 1924-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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