I knew Nick would come through. He is awesome! Here is his reply:
The camera is for the Navy Free Gunnery Self Assessing (FGSA) turret camera for the Martin top turret, in my case for the B-24. I've attached a couple of quick scans from the manual. I have this whole set-up, I just need the Martin turret...
Basically, the sight yoke for a combat B-24 was removed and replaced with a training sight yoke fitted with either a Mark 9 or N-6A sight and the camera bolted to the right side of the sight, the periscopic part of the sight parellel with the gunsight's line of sight. The camera was boresighted from the bottom. It worked like any other gun camera -- when the trigger was pulled, the camera began recording. This camera recorded a reticle image and cross-hairs on the film to show if the gunner was aiming with the correct lead on the target. TMI?
I'm WIX challenged and can't figure out how to post photos or reply to any posts, so would you mind posting these for me? Thanks for letting me give input. I appreciate it.
Look forward to seeing you soon.
Nick




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