I remember discussing our prior tet with my dad while installing it. He was former USAAC/Airlines retiring with over 35K hours! He asked if it had a chain on the front for the tiedowns. I said what are those for? Its a wind indicator.
He said not so much. The tet and tee's are actually considered landing indicators and not wind indicators. I asked what's the difference? He said back in the day, based on the wind, the airfield folks would "set" the pattern by chaining the nose of the indicator to the favorable wind runway.
Again, remember that radio use was less common hence the gigormous size of the tets to be seen afar. Hence their extinction to the company of dodo birds and such.
In todays world we typically use the tets and such as a big honkin windsock. I have found the tet to be extremely sensitive and able to weathervane with even the slightest breath of a wind. And I have a fantastic recipe for dodo birds...
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Bill Goebel
aka TPFD
Vintage Aircraft Services
Aircraft restoration and rebuilding
Rhome, TX
http://www.vintageaircraftservices.net