File:TRG NBS First Swept Vert. Ionogram 1933.jpg

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Image title	Vertical ionogram NBS Published
Date and time of data generation	12:10, 8 May 1933
Latitude	38° 56′ 37.53″ N
Longitude	77° 3′ 50.88″ W
Orientation	Normal
Horizontal resolution	72 dpi
Vertical resolution	72 dpi
Software used	Photos 1.5
File change date and time	12:10, 8 May 1933
Date and time of digitizing	12:10, 8 May 1933
Color space	sRGB
Short title	First Swept Ionogram TRG
Keywords	Gilliland ionograms Radios&Electronics Ted
IIM version	2