For Source reference purposes, any of the Armstrong Whitworth dwgs or photos that I post here, are from the life-long collection of British aviation photographer/author, Chris Ashworth. I do not copy photos from magazines or books,(unless noted and credited). His negative collection here, is some 120,000 negatives, (each in its own glassine envelope, with corresponding typed information) mostly of British Commonwealth aviation, but a great MANY aircraft of other nations as well. For some aircraft types, he only had print collections, and for others just negatives. (The print collection is some 30,000)
I can only assume that these AW dwg images are either his photos(negs) of documents he researched in archives, or from microfilms, or trading with other photo/negative collections.
It is plainly evident from material and supplies in this collection that Ashworth did most of his own photo-processing of all sizes of negatives, developing and printing tens of thousands of photos, long before the Internet and digital imaging.