[QUOTE=skipperbob;6037168]You know maybe I didn't want to use google... maybe I was looking to see what others thought and to get their opinions on an interesting pic. Sorry I took up some of your precious time.[/QUOTE]
You don't have to be sorry about it. Searching the info about B24 models on wiki was fun.:) What saddens me though is the fact when Dinges gave You the right answer all You said is that this wasn't good for You.
I've learned something from it too. Like the introduction of remote controlled turret. I've found this: [URL]http://www.afhra.af.mil/shared/media/document/AFD-090529-108.pdf[/URL]
Bit long, but worth studying. Info about developement of Sperry turrets pages 83 to 90 and 99 to 108. Bendix turret pages 111 to 118.