The Burchall Photographic Slide Rule for 5X4 Inch Plate ?
The Burchall Photographic Slide Rule for 5X4 Inch Plate Camera Using Altitude, Lens Focal Length and Ground Speed - Early Years of Aerial-Photography History - Instructions, Equipment
Picture No
11957317
Media ID
44953117
Size
4739px x 4800px
(4.1MB)
Credit
© aviation-images.com / Mary Evans Picture Library
Source
Photograph by Philip Jarrett from the aviationimages.com collection
Date
1920s
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