This is one of the worst manuals I have found, so much has been left out, like almost everything to do with turrets, bomb gear and cameras.
Comparing my two copies I find not a lot of difference. The later manual has a lot of revisions to Chapt 4, one in Ch 5 and one in the prelim matter, but nothing else when compared to the earlier and officially both have no section 2. The later manual has an earlier version of Ch 11 behind the Ch 2 separator so I will copy the two prelims and the early Ch11 next, followed by the rest of the early manual. Revised Ch4 will be last - it is the most fragile and has a several foldouts that are in less than pristine condition.
Although I thought the later one was much fatter it is bound with the usual shoe lace instead of metal pins to just seems fatter.
I have heard of a 1938 copy and am trying to get my hands on that one as well.