Comment by Mvandenbergh

Some more links on the electromechanical fire computers of the B-29:

http://www.twinbeech.com/CFCsystem.htm (scroll down for technical information from the user manual)

http://www.glennsmuseum.com/bombsights/everything.html#B-29_... (great pictures)

http://web.mit.edu/STS.035/www/PDFs/Newell.pdf A bonus link, review paper on WWII electromechanical fire control computers.