Golden age navigational aids

[Matt Revington]

These concrete arrows, often lit by beacons, pointed the way for airmail service, installed between 1926 and 1932,

http://www.dreamsmithphotos.com/arrow/

[Kurt Kummer]

Thanks Matt.  I'd heard of these navaids before but never seen one.  Now I see I was maybe fifty feet from the one in Great Bend, KS in September when I was there for the Great Bend AirFest.  I wish I'd known.  Thanks again for this fascinating bit of history.