Public domain
Safety device for blind landing of air-track. Washington D.C. The monitoring device of the air-track blind landing in the above photo tells the man on the ground if all the beams are being sent out correctly if there is any error in transmission of the beams this machine will pick It up immediately
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineSafety device for blind landing of air-track. Washington D.C. The monitoring device of the air-track blind landing in the above photo tells the man on the ground if all the beams are being sent out co. 1937-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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