New: photographiczenithtube

ringobones (19)in photographiczenithtube • 6 years ago
Photographic Zenith Tube: The Forgotten Rotational Time Measurement Tool?
If the GPS system ever fails, will the Photographic Zenith Tube be a useful alternative in the measurement of rotational time? During the months leading to Operation Desert Storm, US Navy…
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Photographic Zenith Tube: The Forgotten Rotational Time Measurement Tool?