Geez!
Most of them look like the barrels are bent!
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Indeed. The barrels may appear to be bent, but they are not.
As noted, the images are from a book, likely the authoritative Mauser rimfire book by Jon Speed. When a book is opened, the pages may not lay flat like a single piece of paper on a flat surface. There's some curvature on the book page that is captured when taking its picture.
There are image-taking technologies that are able to reduce the curvature effect, but they don't appear to have been used with the images reproduced above.