Miloch wrote in
news
In article , john
Szalay says...

Miloch wrote in
news
In article , Mitchell
Holman says...




Anyone know what the 'doo-hickey' on top of the wing is?





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its a Fairchild Aerial US Navy BuOrd Machine Gun Camera Mark VI


Thanks!...wasn't aware they went back that far.

https://en.wikipedia.org/wiki/Gun_camera

"Gun cameras are cameras used primarily in aircraft to help measure
tactical effectiveness. These cameras are triggered by the firing of a
weapon, hence the name.

"The use of gun cameras first became common for gunnery training in
the 1920s though examples were used during World War I by the British
Royal Flying Corps. A special version of the standard Lewis Machine
Gun was manufactured as a Camera Gun. During World War II, gun cameras
were commonly used on operational aircraft to record kills of enemy
aircraft. Some of this footage survives to this day and is often the
source for stock footage in World War II movies, TV shows or video
games.




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OOPS:
US Army Air Forces(and Navy) Gun Camera Type H-1
manufactured by the Fairchild Aerial Camera Corporation.