First Flickr Photo
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a grey metal instrumentation box with a numerical counter embedded and various switches, dials and ports. There are labels which say "System 2", Line Count / tension off, Angle / Tension On, Direction / Off/ Elevation (Line Count)
from 2005 sometime. This is from a long-obsolete piece of meteorology equipment: a calibrated kite for measuring wind speeds at different heights by measuring tension and angle of the kite line