Watch from about 6:00min:
https://www.youtube.com/watch?v=uLFHZVX2wpE
The device on top of that bunker is a "Ground Zero Indicator":
http://en.wikipedia.org/wiki/Ground_Zero_Indicator
Actually it is more a kind of rangefinder than a camera in the pictorial meaning, but nevertheless basically it is a pinhole camera.
https://www.youtube.com/watch?v=uLFHZVX2wpE
The device on top of that bunker is a "Ground Zero Indicator":
http://en.wikipedia.org/wiki/Ground_Zero_Indicator
Actually it is more a kind of rangefinder than a camera in the pictorial meaning, but nevertheless basically it is a pinhole camera.
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